Normal hearing in humans depends upon the presence of at least one dominant gene

Question

Normal hearing in humans depends upon the presence of at least one dominant gene from each of two pairs, D and E. If you examined the collective progeny of many DdEe X DdEe marriages, what phenotypic ratio would you expect? Normal hearing in humans depends upon the presence of at least one dominant gene from each of two pairs, D and E. If you examined the collective progeny of many DdEe X DdEe marriages, what phenotypic ratio would you expect? Normal hearing in humans depends upon the presence of at least one dominant gene from each of two pairs, D and E. If you examined the collective progeny of many DdEe X DdEe marriages, what phenotypic ratio would you expect?

Explanation / Answer

DEDE : 1 : DdEe : 2 : dede 1

Thus, the progeny obtained will be in 1:2:1 ratio, exhibiting completely dominant, heterozygous and homozygous recessive traits respectively.

male/female DE de DE DDEE DdEe de DdEe dede

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