Flashcards in CH. 4 Deck (22):
The study of factors affecting gene and genotypic frequencies in a population.
Gene or Allelic Frequency*
The relative frequency of a particular allele in a pop. Designated by p and q
The relative frequency of a particular one-locus genotype in a pop. Designated by P, Q, and H
The frequency of the dominant allele
the frequency of the recessive allele
The effect of selection
Is to increase the gene frequency of favorable alleles. Better set of genes+ better breeding values
The point at which a particular allele becomes the only allele in the pop.
Ex. Purebred black angus
"sets of rules" for determining which selected males is bred to which selected females
the mating of relatives. increases the frequency of homozygosity but decreases the frequency of heterozygosity.
the mating of unrelated individuals. Increases the frequency of heterozygousity and decreases the frequences of homozygoisity
half brothers and/or sisters
an ancestor common to more than one individual
relationship between animals due to kinship
A form of pedigree depicting schematically the flow of genes from ancestors to descendants
Referring to the first generation of crosses between two unrelated (though not necessarily purebred) populations.
Referring to the generation of crosses produced by mating F1 (first-cross) individuals among themselves
A state of constant gene and genotypic frequencies occurring in a pop in the absence of forces that change those frequencies.
Assumptions for H-W Equilibrium
organisms are diploid
Only sexual reproduction occurs
Generations are non-overlapping
Mating is random
Pop size is infinitely large
Allele frequencies are equal in the sexes
There is no migration, mutation or selection
Process that alters DNA to create new alleles
The movement of individuals into or out of a pop.