Ch. 19.1: Genotype, Phenotype, and Allele Frequencies

example of genotype frequencies: there are 1000 genotypes present. AA is 490, Aa is 420, and aa is 90. what is the genotype frequency of aa?

0.09

example of genotype frequencies: there are 1000 genotypes present. AA is 490, Aa is 420, and aa is 90. what is the genotype frequency of Aa?

0.42

example of genotype frequencies: there are 1000 genotypes present. AA is 490, Aa is 420, and aa is 90. what is the genotype frequency of AA?

0.49

the sum of all genotype frequencies is

1.0

example of phenotype frequencies: there are 1000 phenotypes present. AA is 490, Aa is 420, and aa is 90. what is the phenotype frequency of the dominant phenotype?

AA (490) plus Aa (420) equals 910. 910/1000 is 0.91

because diploid organisms have a maximum of two different alleles at each genetic locus:

a single individual typically only has a small fraction of alleles present in a population's gene pool

example of phenotype frequencies: there are 1000 phenotypes present. AA is 490, Aa is 420, and aa is 90. what is the phenotype frequency of the recessive phenotype?

aa is 90 so 90/1000 is 0.09

what are the two kinds of phenotype frequencies?

dominant and recessive

Each population has a

gene pool

evolution of population is measured in terms of what?

genotype frequency, phenotype frequency, and allele frequency

what is a gene pool?

includes all alleles for all the loci present in the population

in allele frequency, if a population has 1000 individuals, then

it has 2000 alleles

example of allele frequencies: there are 1000 individuals present. AA is 490, Aa is 420, and aa is 90. what is the allele frequency of the recessive allele?

it is 0.3 (420 plus 180 is 600. 600/2000 is 0.3)

example of allele frequencies: there are 1000 individuals present. AA is 490, Aa is 420, and aa is 90. what is the allele frequency of the dominant allele?

it is 0.7 (490 plus 490 plus 420 is 1400. 1400/200 is 0.7)

what does the genetic variation that is evident among individuals in a given population indicate?

that each individual has a different subset of the alleles in the gene pool

what is genotype frequency?

the proportion of a particular genotype in the population

what is phenotype frequency?

the proportion of a particular phenotype in the population

what is allele frequency?

the proportion of a specific allele (ie A or a) in a population

the dominant phenotype is

the sum of two genotypes ex: AA plus Aa