On another planet, the locus for brain size is adjacent on the chromosome to the

Question

On another planet, the locus for brain size is adjacent on the chromosome to the locus for head shape, thus the genes display complete linkage. Brain size is controlled by two alleles Big, B and small, b. Head shape is controlled by two alleles, Block, R and round, r. Two individuals, a big brained round head and a small brained block head, homozygous for both traits mate. What are the phenotypes and genotypes of their offspring? If their offspring were to mate, what would be their phenotypic and genotypic ratios?

Explanation / Answer

Genotypes are B, b, R and r

Phenotypes are BBRR, BbRR, BbRr, bbRR, BBrr, bbrr, BbRR

Ratio will be 9:3:3:1 and 1:3

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