Question

In a population of 1000 individuals, 510 show the dominant phenotype. How many individuals would you expect for each of the three possible genotypes for this trait.

Answer 1

Answer:

Explanation:

Total population = 1000 (Given)

Dominant phenotype depicts = 510 (Given)

Thus, it can be inferred that 490  individuals exhibit the recessive trait and therefore have homozygous recessive genotype.

= 490/ 1000  =  0.49  = q²

q = 0.7

p+q  =  1  

p = 1-q

p = 1-0.7 = 0.3

Thus,

p² = 0.09 and q² = 0.49

2pq = 2(0.7)(0.3) = 0.42

Therefore,

0.42(1000)  =  420  = heterozygous genotype

0.09(1000)  =  90  = homozygous dominant genotype

0.49(1000)  =  490  = homozygous recessive genotype