Chapter 23 Vocab Flashcards
population genetics
investigative processes that cause changes in allele and genotype frequencies in populations
gene pool
all the alleles of all the genes in a certain population
inbreeding
mating between closely related individuals
deleterious allele
alleles that decrease fitness
inbreeding depression
decline in average fitness that may take place when homozygosity increases and heterozygosity decreases in a population
sexual selection
favors individuals with traits that increase their ability to obtain mates
ecological selection
favors individuals with heritable traits that enhance their ability to survive and reproduce in certain physical and/or biological environment, excluding ability to obtain a mate
genetic variation
number and relative frequency of alleles that are present in a particular population
purifying selection
decreases frequency of, or even eliminates, deleterious alleles
intersexual selection
between species, one sex is selecting the other sex for mating
intrasexual selection
within a sex, competing among members of the same sex for mating
territory
actively defended area where owner has exclusive or close to exclusive use
sexual dimorphism
any trait that differs between male and female
- make and female usually look different
sexual polymorphism
any trait that occurs in 2 or more forms among females and males in population
genetic drift
change in allele frequencies in a population that is due to chance