Wharthogs on Planet Zeta are either white or purple. A pure-bred male white Whar

Question

Wharthogs on Planet Zeta are either white or purple. A pure-bred male white Wharthog was mated with a pure-bred female purple Wharthog. They had ninety progeny, all of whom were purple. [Wharthogs are very prolific, especially in the special atmosphere on Planet Zeta.]

P white X purple

F1 all purple (ninety total)

F2 900 purple 700 white

The ninety F1 progeny were randomly interbred and produced a total of 1600 F2 progeny. Nine hundred of these F2 progeny were purple and 700 were white.

A. Based on this data alone, how many genetic loci control hearing in Wharthogs?

Explanation / Answer

Genetic loci can be estimated by finding allele frequencies. In F2 population there are 900 purple which include homozygous(XX) and heterozygous (PX). But white progenies are homozygous (PP) 700 in number out of total 1600. Out of 1600,

f(PP)= 700*2+900= 2300 observed copies of P allele in total population.

As the f(XX) is not given in data, we cannot determine frequency of X in PX and XX accurately.

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