Suppose that a species of beetle has several different possible body colors. Thi

Question

Suppose that a species of beetle has several different possible body colors. This color is controlled by two pigment genes, B and R. The en dash in the following genotypes signifies that either allele of the gene could be present. Beetles that are B– R– have brown shells; beetles that are B– rr have blue shells; beetles that are bb R– have red shells; and beetles that are bb rr have white shells. A blue beetle is crossed to a red beetle.

The F1 progeny from the cross is comprised of 80 brown, 82 blue, 85 red, and 79 white beetles. What are the genotypes of the parents?

Explanation / Answer

The F1 ratio is near to 1:1:1:1.

This phenotype occurs when heterozygous parent is crossed with homozygous recessive parent.

Based on the above punnett square, the genotypes of the parents are as follows:

BbRr and bbrr

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