Assume that a cross is made between AaBb and aabb plants and that the offspring occur in the following numbers: 106 AaBb,48 Aabb,52 aaBb,94 aabb.These results are consistent with which scenario described? A)It is impossible to tell. B)There is a very high coefficient of coincidence. C)The genes are unlinked. D)In the AaBb parent,the dominant alleles are on one homolog and the recessive alleles are on the other. E)In the AaBb parent,each homolog has one dominant allele and one recessive allele.

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The offspring ratios suggest that the dominant alleles (A and B) are linked on one chromosome and the recessive alleles (a and b) are linked on the other chromosome in the AaBb parent, leading to a non-Mendelian ratio that is best explained by linkage, as seen in choice D.

Assume That a Cross Is Made Between AaBb and Aabb