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In: Biology

Say a population of fish exhibit two slightly different phenotypes; long fins vs. short fins. The...

Say a population of fish exhibit two slightly different phenotypes; long fins vs. short fins. The B allele is dominant = long, the b allele is recessive = short. If there are 160 fish in the population, 60 are homozygous dominant calculate the following: How many individuals are homozygous for the B allele? What is the frequency of individuals that are homozygous for the B allele? What is the frequency of the B allele? What is the frequency of the b allele? What is the frequency of individuals that are homozygous for the b allele? How many individuals are homozygous for the b allele? What is the frequency of individuals that are heterozygous? How many individuals are heterozygous? How many fish have long fins? How many fish have short fins?

Solutions

Expert Solution

According to Hardy-Weinberg equilibrium allelic frequency is always one

So B+b =1

Genotype frequency is given by B2+ b2+2Bb =1

Given that there are 160 fish in the pond out of which 60 are homozygous dominant

So the frequency of homozygous dominant will be 60/160 = 0.375.

B2 = 0.375

B = 0.61

B+b =1

So b = 1-B

= 1-0.61

b = 0.39

The frequency of homozygous recessive will be b2 = 0.39*0.39 = 0.155

Frequency of heterozygous will be 2*B*b = 2*0.61*0.39 = 0.47

Number of the individual having homozygous recessive gene will be 0.155*160 = 25

NUmber of individual having heterozygous condition i.e. Bb allele will be 0.47*160 = 75.

How many individuals are homozygous for the B allele = 60

What is the frequency of individuals that are homozygous for the B allele = 0.375

What is the frequency of the B allele = 0.61

What is the frequency of the b allele = 0.39

What is the frequency of individuals that are homozygous for the b allele 0.155

How many individuals are homozygous for the b allele = 25

What is the frequency of individuals that are heterozygous= 0.47

How many individuals are heterozygous = 75

How many fish have long fins fish having genotype BB and Bb will have long fins so total number will be 60+75 = 135

How many fish have short fins 25

gladiator answered 2 years ago
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