Lecture 21 Vocab and Pre-reading Flashcards
adaptation
trait that enhances the fitness of an organism to its environment
allele frequency
proportion of a specified allele among all the alleles of a gene in a population
anisogamy
where sex cells come together for reproduction (larger eggs and smaller sperm)
balancing selection
where there are diff traits that help animals in diff ways and neither one completely takes over
bottleneck
event that sharply reduces the size of a population leading to a decrease in genetic diversity
directional selection
nature pushing things in a certain direction based on what works better in the environment
disruptive selection
nature favors both extreme traits
fitness
how good u can reproduce and stuff and pass ur traits down
fixed allele
when every individual in that population has the same allele for that gene
founder effect
occurs when a small group of individuals starts a new population
gene flow
movement of genes between different populations
gene pool
huge collection of genetic information in a population
genetic drift
random and unpredictable change in the frequency of alleles in a population over generations
genetic variation
diversity of traits within a population
intersexual selection
intrasexual selection
migration
seasonal movement of animals
sexual dimorphism
distinct physical difference between females and males of the same species
sexual selection
certain traits or behaviors become more common in a population because they make individuals more attractive to potential males
stabilizing selection
favoring intermediate traits
trade off
situation where gaining something involves giving up something else
