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27-11-2019
Biology

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In freshwater snails, pigment color is influenced by two genes. If two heterozygous pigmented freshwater snails were crossed and offspring were produced in a ratio of 9 pigmented snails to 7 albino snails, what are the genotypes of the offspring?

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Milliecartier Milliecartier

27-11-2019

Answer:

The typical ratio of a dihybrid cross is 9:3:3:1 for the genotypes A_B_: aaB_: A_bb: aabb. Hence the ratio of 9:7 means the aaB_, A_bb and aabb all exhibit the same phenotype. So long as a gene is homozygous recessive at Gene A or Gene B, a recessive phenotype would be observed. Hence the genotypes of the offspring would be AABB, AaBB, AABb, aaBb, aaBB, AAbb, Aabb and aabb.

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