Unit 1 Flashcards
Name and define the 3 components of the equation for Natural Selection.
- Variation: Some trait variants increase the chance of survival or reproduction
- Heritability: These traits are inherited by offspring
- Selection: More individuals are born than can survive to reproduce.
___ says that genetic material/proteins activate other genes/proteins in certain regions of the embryo and eventually turn on Hox genes that determine where body segments and limbs will form.
Regulatory Gene Cascade
True or False?
Darwin was the first scientist to propose the idea of evolutionary change.
False
The ___ states that each pair of homologous chromosomes separates during meiosis so that only one allele for a given trait will be present in each of the gametes produced.
Law of Segregation
___ states that different traits are inherited independently of one another.
Mendel’s Law of Independent Assortment
A(n) ___ is a testable prediction that might identify or explain a phenomena.
Hypothesis
A ___ is a sequence of base pairs on a strand of DNA that can make a protein or a segment of genetic material that will perform a function.
Gene
What is the exception to Mendel’s Law of Independent Assortment?
Traits on the same chromosome do not assort independently
Human adaptation primarily refers to…
A. The development of specific, gene-based traits.
B. Changes that occur during growth and development
C. Reversible acclimatization
D. Cultural ways and behavioral patterns
A
During Protein Synthesis, a DNA base coded by AAA will code as ___ for mRNA and as ___ for the tRNA anticodon.
UUU; AAA
___ is the process during which mRNA becomes a protein.
Translation
Populations have ___, which means that members of the population cannot interbreed with members of another population.
Reproductive Isolation
Genes:
A. Are segments of DNA that code for proteins
B. Are located on chromosomes
C. Come in pairs but segregate durign the formation of gametes
D. Assort independently of each other if they are on different chromosomes
E. All of the above are true
E
In the Hardy-Weinberg equation, q = …
Percentage of all alleles for a trait that are recessive
___ states that the Earth is changed by natural processes operating both today and in the past.
Uniformitarianism
Genetic drift:
A. Occurs when individuals exhibiting a particular trait produce fewer offspring than others in the population
B. Describes a random change in a DNA sequence during the replication process
C. Is a random change in allele frequencies across several generations
D. Results from interbreeding between two or more populations.
C
___ founded Demography, which says that only some will find enough food to survive and reproduce.
Thomas Malthus
Which process can result in a difference of size, appearance, and/or behavior between opposite sexes of the same species?
Sexual Selection
During mRNA Modification, the ___ are cut out of mRNA before it leaves the nucleus to form a continuous coding sequence.
introns
___ presented the binomial nomenclature taxonomy of plants and animals.
Carolus Linnaeus
Name the 4 basic steps of Mitosis.
- Begin with a diploid (46 chromosomes)
- Chromosomes duplicate
- Lining up, spindle forms
- Pulls apart to produce 2 identical daughter cells
What are the 3 main components of DNA?
Phosphate group, sugar, and a nitrogenous base (Adenine)
___ bred together pea plants that had different versions (alleles) of the same trait (genes) and deduced how genes are passed.
Gregor Mendel
Name the 6 steps of the scientific method.
- Make observations
- Define problem
- Propose hypothesis
- Gather evidence and test hypothesis
- Either reject or retain hypothesis for further testing
- Draw conclusion / develop theory
___ are noncoding DNA that do not produce a specific protein but can cause mRNA to code differently to produce different proteins.
Introns
A(n) ___ is a chain of amino acids held together by multiple peptide bonds.
Polypeptide
Name the 3 causes of genetic drift.
- Individuals with a certain allele randomly leave behind more offspring.
- Bottleneck Effect
- Founder Effect
Acquired inheritance is seen in ___, where some behaviors or conditions can influence genes in the next generation.
Epigenetics
The ___ is the part of the cell that stores the DNA containing the majority of your genes.
Nucleus
A(n) ___ is just a body cell, whereas a(n) ___ is a sexual reproduction cell.
Somatic cell; Gamete
___ are fibers located in the nucleus of the cell that carry genes.
Chromosomes
Greyhounds, a dog breed, were produced by humans breeding the fastest males and fastest females from each generation. What is this called?
Artificial selection
Somatic cells are ___ because they have a full 46 chromosomes, while gametes are ___ because they only have 23.
Diploid; Haploid
The ___ says that actions during life cause new traits in the body and those traits are then passed onto offspring.
Lamarckian Inheritance of Acquired Characteristics
What is the most prominent example of Heterozygote Advantage?
The Sickle Cell Allele
Which of the following is NOT one of the four major assumptions of Hardy-Weinberg equilibrium?
A. None of the four forces of evolution are in operation
B. The population is infinitely large
C. All members of the population produce the same number of offspring
D. Mating is non-random
E. All of the above are assumptions of Hardy-Weinberg equilibrium
D
The ___ occurs when a large portion of the population is eliminated so that only a few individuals remain.
Bottleneck Effect
Name the four assumptions of the hardy-Weinberg equation.
- No mutations, gene flow, genetic drift, or natural selection is occurring
- Population is infinitely large
- Mating is random
- All members produce the same number of offspring
A(n) ___ mutation occurs when a change in base pair within a codon does not change the amino acid.
Synonymous Point
___ can produce new genetic variation within a population, while the other forces of evolution only operate on pre-existing variation.
Mutation
In ___, a certain trait is appealing to the opposite sex so the animal with the trait has more mating opportunities.
Sexual Selection
A(n) ___ mutation is when a random mistake occurs during cell division.
Spontaneous
A(n) ___ is the 3 complementary bases that match the mRNA codon during Translation.
Anticodon
Gene flow between adjacent populations can cause ___, which are gradual changes in genotype or phenotype over a geographic area.
Clines
If a homozygous individual expressing the DD genotype for a trait is crossed with a heterozygous Dd individual, what percentage of the resulting offspring, on average, woudl be expected to exhibit the recessive phenotype?
0%
Name the 3 conditions of Natural Selection.
- Variation
- Heritability
- Selection
Name the 3 observations that evolution occurs.
- The earth is old enough for species to change
- Species have changed
- Some species have similar features that make them appear to be more closely related
True or False?
All mutations result in negative consequences for the individual and his or her offspring.
False
Heritable mutations that have evolutionary consequences, meaning they will be passed to future generations, occur:
A. In somatic cells
B. In gametes
C. Only during mitosis
D. All of the above are true
B
A(n) ___ is all of the variation in a population at a specific genetic locus.
Gene Pool
Name the 3 features of explanatory hypotheses.
- Can explain observations
- Can predict future results
- Can be refuted by new evidence
Name and define the 4 forces of evolution.
- Mutation: Alleles randomly change into new alleles
- Gene Flow: Alleles move into or out of a population
- Genetic Drift: Chance events change allele frequency
- Selection: Survival and reproduction makes advantageous alleles more common
___ are genes that are found close together on the same chromosome.
Linked Genes
The ___ occurs when a small group migrates to a new region and is reproductively isolated.
Founder Effect
A(n) ___ is a complete set of chromosomes
Karyotype
___ is the average number of offspring from a parent with a given trait variant.
Fitness
___ is the study of changes in the frequency of alleles in a population.
Population Genetics