TIG108 - Evolutionär Psykologi - 2024-10-29 Flashcards
Inheritance
Definition: Inheritance is the passing of traits from parents to offspring through genetic material.
Explanation: Imagine a family recipe passed down through generations. Each cook adds their own twist, but the core ingredients remain the same. Similarly, genes are passed down, creating similarities between family members, but with variations.
Variation
Definition: Variation refers to the differences in traits among individuals within a population.
Explanation: Imagine a family portrait: each member has unique features, like hair color or height. This is variation within a family, just like differences in beak size among finches are variation within a species.
Mutation
Definition: Mutation is a permanent alteration in the DNA sequence of an organism, which can result in changes to the organism’s traits.
Explanation: Imagine a recipe for a cake. A mutation is like a typo in the recipe, changing an ingredient or instruction. This change can result in a slightly different cake, just like a mutation can lead to a slightly different organism.
Recombination
Definition: Recombination is the process by which genetic material from two parents is combined to create a new, unique genetic makeup in their offspring.
Explanation: Imagine shuffling a deck of cards: each parent’s genes are like a deck, and recombination is like shuffling those decks together to create a new, unique hand for their child.
Adaptation
Definition: Adaptation is the process by which organisms evolve traits that increase their survival and reproduction in a specific environment.
Explanation: Imagine a bird with a beak perfectly shaped for cracking open seeds. This beak is an adaptation that helps the bird survive and reproduce in an environment where seeds are abundant.
Selection
Definition: Selection is the process by which organisms with traits better suited to their environment survive and reproduce more successfully, passing those advantageous traits to their offspring.
Explanation: Imagine a group of birds with different beak shapes. If only seeds of a certain size are available, birds with beaks best suited for those seeds will eat more, survive longer, and have more offspring, leading to a population with more of those beak shapes.
Natural Selection
Definition: Natural selection is the process by which organisms with traits better suited to their environment survive and reproduce more successfully, passing those advantageous traits to their offspring.
Explanation: Imagine a group of birds with different beak shapes. If only seeds with hard shells are available, birds with strong beaks will survive and reproduce more, passing on their strong beak genes to their offspring. Over time, the population will be dominated by birds with strong beaks.
Sexual Selection
Definition: Sexual selection is a type of natural selection where individuals with traits that increase their chances of mating and producing offspring are favored, leading to the evolution of these traits.
Explanation: Imagine a peacock with a magnificent tail. It’s not the most practical for survival, but it attracts mates, increasing his chances of passing on his genes. This is sexual selection: traits that boost mating success, even if they’re not directly beneficial for survival, can evolve.
Intersexual Selection
Definition: Intersexual selection is a form of sexual selection where individuals of one sex (usually females) choose mates based on specific traits in the opposite sex.
Explanation: Imagine a peacock with its dazzling tail feathers. Females choose males with the most impressive displays, leading to the evolution of these extravagant traits, even if they make the males more vulnerable to predators. This is intersexual selection in action.
Intrasexual Selection
Definition: Intrasexual selection is a type of natural selection where members of the same sex compete for access to mates.
Explanation: Imagine a group of peacocks competing for the attention of a female. The peacock with the most impressive tail feathers wins, just like how individuals with traits that make them better competitors for mates are more likely to reproduce.
Artificial Selection
Definition: Artificial selection is the process by which humans intentionally breed organisms with desirable traits, leading to changes in the population over generations.
Explanation: Imagine a farmer choosing only the biggest, juiciest tomatoes from their garden to plant next year. Over time, the tomatoes in the garden will become larger and juicier, just like how artificial selection works.
Allele
Definition: An allele is a variant form of a gene, occupying a specific locus on a chromosome.
Explanation: Imagine a gene as a recipe for a trait, like eye color. Alleles are like different versions of the recipe, leading to variations like blue or brown eyes.
Genotype
Definition: A genotype refers to the genetic makeup of an organism, encompassing the specific alleles or variations of genes it possesses.
Explanation: Imagine a recipe for a cake. The genotype is like the recipe itself, outlining the ingredients (genes) and their specific versions (alleles) that determine the final product (organism).
Phenotype
Definition: Phenotype refers to the observable characteristics of an organism, resulting from the interaction of its genotype with the environment.
Explanation: Imagine a recipe for a cake (genotype). The actual cake you bake (phenotype) depends not only on the recipe but also on the ingredients you use and how you bake it (environment).
Homozygous
Definition: Homozygous refers to an individual possessing two identical alleles for a specific gene.
Explanation: Imagine a recipe for cookies. If you have two identical cookie cutters (alleles), you’ll make cookies that are all the same (homozygous).
Heterozygous
Definition: Heterozygous refers to an individual possessing two different alleles for a specific gene.
Explanation: Imagine you have two boxes, one with a red ball and the other with a blue ball. If you pick one ball from each box, you have a heterozygous pair, representing different versions of the same gene.
Dominant Allele
Definition: A dominant allele is a version of a gene that masks the expression of its recessive counterpart when both are present in an individual.
Explanation: Imagine a loud speaker (dominant allele) and a whisper (recessive allele). Even if both are present, you’ll only hear the loud speaker, just as the dominant trait is the one you see.
Recessive Allele
Definition: A recessive allele is a version of a gene that only expresses its trait when two copies of it are present, one from each parent.
Explanation: Imagine a gene for eye color, where brown (B) is dominant and blue (b) is recessive. If you have one B and one b, you’ll have brown eyes. But if you have two b’s, you’ll have blue eyes, like having two blue paint drops instead of one blue and one brown.
Mendelian Genetics
Definition: Mendelian genetics is the study of how traits are passed from parents to offspring, based on the principles of inheritance discovered by Gregor Mendel.
Explanation: Imagine a deck of cards: each card represents a gene, and each suit represents a different version of that gene (allele). When you shuffle the deck, you’re creating a new combination of genes, just like how parents pass on their traits to their children.
Law of Segregation
Definition: The Law of Segregation states that during gamete formation, the two alleles for each gene separate, so that each gamete receives only one allele.
Explanation: Imagine a deck of cards with two suits: hearts and spades. Each card represents an allele. When you shuffle the deck, each card (allele) has an equal chance of being drawn (passed on to a gamete), ensuring that offspring inherit one allele from each parent.
Law of Independent Assortment
Definition: The Law of Independent Assortment states that during gamete formation, alleles for different traits separate independently of one another.
Explanation: Imagine a deck of cards. When you shuffle the deck, the suit of a card (e.g., hearts) doesn’t influence the rank of another card (e.g., king). Similarly, genes for different traits (like eye color and hair color) are shuffled independently during meiosis, resulting in diverse combinations of traits in offspring.
Chromosomes
Definition: Chromosomes are thread-like structures located inside the nucleus of a cell that carry genetic information in the form of genes.
Explanation: Imagine chromosomes as instruction manuals for building a human. Each chromosome contains a set of genes, like chapters in the manual, that determine traits like eye color or height.
DNA
Definition: DNA, or deoxyribonucleic acid, is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.
Explanation: Imagine DNA as a recipe book for life. It contains the instructions for building and maintaining an organism, just like a recipe book tells you how to make a cake.
Single Nucleotide Polymorphisms (SNPs)
Definition: Single Nucleotide Polymorphisms (SNPs) are variations in a single nucleotide at a specific position in the genome, occurring in at least 1% of the population.
Explanation: Imagine a recipe for a cake, where a single ingredient is slightly different in different versions. SNPs are like these variations in the ‘recipe’ of our DNA, leading to unique traits and predispositions.
Genome-Wide Association Studies (GWAS)
Definition: Genome-Wide Association Studies (GWAS) are a type of observational study that scans the entire genome of a large group of individuals to identify genetic variations associated with a particular trait or disease.
Explanation: Imagine searching for a specific ingredient in a massive cookbook. GWAS is like scanning every recipe in the cookbook to find the ones that contain that ingredient, helping us understand how genes contribute to certain traits or diseases.
Heritability
Definition: Heritability is a statistical measure that estimates the proportion of variation in a trait within a population that is due to genetic differences.
Explanation: Imagine a family garden with different flower colors. Heritability tells us how much of the color variation is due to the seeds (genes) versus the soil and sunlight (environment).
The Selfish Gene
Definition: The Selfish Gene theory proposes that genes, not individuals, are the primary units of selection in evolution. Genes act to perpetuate themselves by influencing the behavior and survival of organisms.
Explanation: Imagine genes as tiny, selfish robots that build bodies to help them survive and reproduce. They ‘want’ to make as many copies of themselves as possible, even if it means sacrificing the individual organism.
Kin Selection
Definition: Kin selection is a form of natural selection where individuals sacrifice their own reproductive success to increase the survival and reproduction of their relatives, who share their genes.
Explanation: Imagine a group of ants. A worker ant might risk its life to protect the queen, even though it won’t reproduce itself. This is because the queen is its relative, and by protecting her, the worker ant indirectly increases the survival of its own genes.
Inclusive Fitness
Definition: Inclusive fitness is a theory that proposes an organism’s reproductive success is measured by its contribution to the survival and reproduction of its genes, both through its own offspring and those of its relatives.
Explanation: Imagine a family tree. Your genes are passed down through your children, but also through your siblings, nieces, and nephews. Inclusive fitness considers the success of your entire genetic lineage, not just your direct offspring, like a family business where everyone benefits from shared success.
Reciprocal Altruism
Definition: Reciprocal altruism is a behavioral strategy where individuals provide benefits to others, expecting that those benefits will be reciprocated in the future.
Explanation: Imagine a group of friends sharing tools. Each person lends a tool, knowing they’ll likely need to borrow one themselves later. This mutual exchange of favors is like reciprocal altruism, where cooperation benefits everyone in the long run.
Group Selection
Definition: Group selection is a process where natural selection favors traits that benefit the group, even if those traits are detrimental to individual fitness.
Explanation: Imagine a group of ants working together to build a nest. Even though some ants might die in the process, the nest benefits the entire colony, making group selection a powerful force in evolution.
Tangled Bank Theory
Definition: The Tangled Bank Theory, proposed by Charles Darwin, posits that the diversity of life arises from the interplay of competition and cooperation among species within a complex ecosystem.
Explanation: Imagine a garden with various plants competing for sunlight and nutrients. Some plants grow tall, others spread wide, and some even develop defenses against herbivores. This intricate web of interactions, like the tangled bank, drives evolution and creates the rich tapestry of life we see.
Red Queen Theory
Definition: The Red Queen Theory proposes that species must constantly evolve and adapt to maintain their fitness in an ever-changing environment, often due to co-evolutionary pressures from other species.
Explanation: Imagine a race where you need to run faster just to stay in the same place. That’s the Red Queen effect. Species are constantly evolving to outcompete each other, like an arms race, just to survive.
Coevolutionary Arms Race
Definition: Coevolutionary arms race is a continuous cycle of reciprocal adaptation between two species, where each species’ adaptations drive the evolution of the other.
Explanation: Imagine a predator and prey constantly evolving to outsmart each other. The predator gets faster, so the prey gets faster too, leading to a never-ending race for survival.
Life History Theory
Definition: Life history theory is a framework that explains how natural selection shapes an organism’s allocation of resources throughout its lifetime, influencing traits like age at maturity, reproductive effort, and lifespan.
Explanation: Imagine a budget for your life. Life history theory is like figuring out how to spend that budget on things like growing up quickly, having lots of babies, or living a long time. The best strategy depends on your environment and what resources are available.
r-selection
Definition: r-selection is a life-history strategy that emphasizes high reproductive rates and rapid development, often in unpredictable environments.
Explanation: Imagine a dandelion: it produces tons of seeds, ensuring some survive even in harsh conditions. This is r-selection - prioritizing quantity over quality in offspring.
K-selection
Definition: K-selection is a life-history strategy where organisms prioritize survival and resource efficiency in stable environments, producing fewer offspring with higher investment in parental care.
Explanation: Imagine a forest with limited resources. K-selected species like oak trees produce few, strong acorns, ensuring their offspring have a good chance of survival in the competitive environment. It’s like investing in a few high-quality stocks instead of many risky ones.
Behavioral Genetics
Definition: Behavioral genetics is a field that investigates the interplay between genetic and environmental factors in shaping behavioral traits.
Explanation: Imagine a plant’s growth. Genetics provides the blueprint, but the environment (sunlight, water) determines how that blueprint is expressed. Similarly, behavioral genetics explores how genes and experiences interact to influence our actions and personalities.
Cognition
Definition: Cognition refers to the mental processes involved in acquiring knowledge and understanding through thinking, perceiving, learning, remembering, and problem-solving.
Explanation: Imagine your brain as a powerful computer. Cognition is like the software that allows it to process information, learn from experiences, and make decisions, just like a computer program uses code to function.
Modular Cognition
Definition: Modular cognition is the idea that the human mind is composed of distinct, specialized modules, each responsible for processing specific types of information.
Explanation: Imagine your brain as a toolbox, with each tool (module) designed for a specific task, like a hammer for nails and a screwdriver for screws. Each module works independently, but together they allow us to handle complex cognitive tasks.
Domain-Specific Cognition
Definition: Domain-specific cognition refers to the idea that our minds are not a general-purpose problem solver, but rather are composed of specialized modules designed to handle specific types of information and tasks.
Explanation: Imagine your brain as a toolbox. Each tool is designed for a specific job, like a hammer for nails or a screwdriver for screws. Similarly, domain-specific cognitive modules are specialized for tasks like language, navigation, or social interaction.
Domain-General Cognition
Definition: Domain-general cognition refers to cognitive abilities that are not specific to any particular domain of knowledge or skill, but rather apply broadly across different situations and tasks.
Explanation: Imagine a Swiss Army knife: it has various tools for different purposes, but the underlying mechanism (the knife itself) is the same. Domain-general cognition is like that � a set of mental tools that can be used for various tasks, like problem-solving, learning, and reasoning.
Theory of Mind (ToM)
Definition: Theory of mind (ToM) is the cognitive ability to attribute mental states�beliefs, intents, desires, emotions, knowledge�to oneself and others, and to understand that these states can differ from one’s own.
Explanation: Imagine you see a friend reaching for a cookie jar. ToM allows you to understand that your friend wants the cookie, even if you don’t want it yourself. It’s like having a mental map of other people’s minds.
Cognitive Biases
Definition: Cognitive biases are systematic errors in thinking that occur due to our brains’ tendency to simplify information processing, leading to inaccurate judgments and decisions.
Explanation: Imagine you’re trying to find a specific book in a library. You might only look in the section you think it’s in, ignoring other possibilities. This is like a cognitive bias � we often rely on shortcuts, missing important information.
Heuristics
Definition: Heuristics are mental shortcuts or rules of thumb that allow us to make quick decisions and judgments, often based on incomplete information.
Explanation: Imagine you’re trying to find a specific book in a library. Instead of meticulously checking every shelf, you might use a heuristic like ‘look for books with similar titles’ to narrow down your search. Heuristics are like mental shortcuts that help us make decisions faster, even if they aren’t always perfect.