You are studying a population or sunflowers and you Observe

You are studying a population or sunflowers and you Observe that there are two alleles for stem length. Allele 1 codes for fat stems and Is dominant over allele 2, which codes for thin stems. Allele 2 is at a frequency of 20% of the population, what should be the frequency of allele 1 homozygotes? 0.04 0.32 0.50 0.64 0.89 You are studying forget-me-nots and you discover that there are two flower colors (blue and white) that follow Mendelian inheritance patterns. Breeding data suggest that the blue allele is dominant to the white allele, and when you examine 200 flowers from your wild population you find 32 plants with white flowers. Based on this, what would you expect to be the frequency of the blue allele? 13% 36% 50% 60% 84%

Solution

The answer is 0.32

For explanation find the below working solution:

HardyWeinberg law = (a+b)^2 = a^2+2ab+b^2= 1

Allele 1 = a and allele 2= b

bb = 20% = 20/100 = 0.2

b = sqrt(0.2) = 0.44

a = 1-b = 1-0.44 = 0.56

The frequency of homozygotes for allele 1 = 0.56 X 0.56 = 0.31 ~ 0.32

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