KVPY SX SB Exam 2016 Question Paper

Question : 112 of 120

Marks: +1, -0

A human population containing 200 individuals has two alleles at the 'T' locus, named T and t. T, which produces tall individuals, is dominant over t, which produces short individuals. If the population has 90 TT, 40 Tt and 70 tt genotypes, what will be the frequencies of these two alleles in this population ?

T, 0.50 ; t, 0.50
T, 0.55 ; t, 0.45
T, 0.45 ; t, 0.35
T, 0.90 ; t, 0.10

Validate

Solution:

A population with 200 individual has 90TT, 40 Tt and 70 tt genotypes
i.e. dominant allele (T) is TT + Tt
i.e. 90 + 90 + 40 = 220
Recessive allele (t) is Tt + tt
i.e. 40 + 70 + 70 = 180
Total allele = 400
Dominant allele (T) frequency =

220/400 = 0.55

Recessive allele (t) frequency =

180/400 = 0.45

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