1) Given two alleles- B with a frequency p of 0.6, and b with a frequency q of 0
ID: 33595 • Letter: 1
Question
1) Given two alleles- B with a frequency p of 0.6, and b with a frequency q of 0.4 - what frequency of individuals homozygous for B is predicted by the Hardy-Weinberg equation? What frequency of individuals homozygous for b would you expect? What frequency of heterozygots?
2) In a population of rabbits the gene for coat color displays classic Mendelian dominance- that is, individuals homozygous for the dominant allele D and heterozygotes all have dark coats, and only homozygous recessive individuals have light coats. If individuals with light coats comprise 25% of the population, what is the value of q and what is the value of p? What percentage of the population is made up of homozygous dominant individuals, and what percentage are heterozygots?
Explanation / Answer
1) Given two alleles- B with a frequency p of 0.6, and b with a frequency q of 0.4 - what frequency of individuals homozygous for B is predicted by the Hardy-Weinberg equation? What frequency of individuals homozygous for b would you expect? What frequency of heterozygots?
P^2 =0.6x0.6 =0.36
frequency of Homozygous dominant for for B
frequency of heterozygots
2pq=2 x 0.6x 0.4 =0.48
q^2 =0.4x0.4 =0.16
frequency of homozygous recessive for b
2) In a population of rabbits the gene for coat color displays classic Mendelian dominance- that is, individuals homozygous for the dominant allele D and heterozygotes all have dark coats, and only homozygous recessive individuals have light coats. If individuals with light coats comprise 25% of the population, what is the value of q and what is the value of p? What percentage of the population is made up of homozygous dominant individuals, and what percentage are heterozygots?
q^2 =25%
q=0.5
p=0.5
P^2 =0.5x0.5 =0.25
frequency of Homozygous dominant
dark coats,
2pq=2 x 0.5x 0.5 =0.50
frequency of heterozygots
dark coats,
q^2 =0.5x0.5 =0.25
frequency of homozygous recessive
light coats.
P^2 =0.6x0.6 =0.36
frequency of Homozygous dominant for for B
frequency of heterozygots
2pq=2 x 0.6x 0.4 =0.48
q^2 =0.4x0.4 =0.16
frequency of homozygous recessive for b
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