Question

Stalk height in a population of wild okra plants is determined by two alleles at a locus, T and t, which display incomplete dominance. TT individuals are tall, Tt are medium height, and tt are short. There are 36 short plants out of 100. How many plants do you expect to be tall if the population is in HW equilibrium?a) 64b) 0.16c) 16

Answer 1

Answer:

Option B

Explanation:

Given ,

there is incomplete dominance of allele T and t when they pair together. Thus, TT genotype individuals are tall, Tt genotype individuals are medium heighted and tt genotype individuals are short.

Total number of plants $= 100$

Number of short plants with genotype tt $= 36$

If the given population is in HW equilibrium, then as per the 1st equilibrium rule of HW

$p + q = 1$

where p is the frequency of dominant allele and q is the frequency of

recessive allele.

Here

$q^2 = \frac{36}{100}\\= 0.36\\q = 0.6$

$p + q = 1\\p + 0.6 = 1\\p = 1-0.6\\p = 0.4$

Frequency of tall individuals with genotype "TT"

$p^2 = 0.4^2\\p^2 = 0.16$

Hence, option B is correct