If you know the proportion of F₂ individuals that are of parental phenotypes,what formula will tell you how many gene pairs are influencing the trait?
A)1/4ⁿ
B)N¹/⁴
C)VE + Vg
D)H²/h²
E)2n + 1

Question

Quizplus · Accepted Answer

The proportion of F₂ individuals that are of parental phenotypes can be used to determine the number of gene pairs influencing the trait through the formula 1/4ⁿ, where n is the number of gene pairs involved in the trait. The parental phenotypes occur when the F₁ individuals are heterozygous for the trait, which means that the ratio of genotypes in the F₂ generation will be 1:2:1 (homozygous dominant:heterozygous:homozygous recessive), or 3/4 dominant and 1/4 recessive. In the case of parental phenotypes, the ratio is 3:1, which is 1/4 of the total. Thus, if the proportion of parental phenotypes is known, the number of gene pairs can be determined using the formula 1/4ⁿ.

If You Know the Proportion of F₂ Individuals That Are