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Ovules from a pure-breeding green plant are fertilized with pollen from a pure-breeding yellow plant. All of the progeny are green. When the reciprocal cross is performed, all of the progeny are yellow. What do these results suggest?

a) Yellow is completely dominant to green.
b) The yellow and green alleles are codominant.
c) Color is determined by a sex-linked gene.
d) Color is maternally inherited.

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mshurtado

Answer:

D)

Explanation:

Color is determined by a sex-linked gene, X gene, so, in order to that, the gene is maternally inherited.   When one gene is related to the X chromosome, and one of the alleles is recesive and the other, logically dominant, the first generation will be of a single color, and the second generation will be of the other single color.  

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