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In a species of tortoise,foot size (big or small)is controlled by one gene,while shell shape (round or lumpy)is controlled by another gene.Suppose that a big-footed lumpy-shelled tortoise mates with a small-footed round-shelled tortoise.Eight offspring result: four big-footed round-shelled tortoises and four small-footed round-shelled tortoises.(Assume that the parents are not necessarily homozygous for each allele. )
-Which statement about the inheritance of shell shape in tortoises is most likely to be correct,given your genetic analysis of the tortoise family?
A) Lumpy is dominant to round.
B) Round is dominant to lumpy.
C) Round and lumpy are codominant.
D) Shell shape is an example of blending inheritance.
E) This cannot be answered without more information.

Question

Quizplus · Accepted Answer

If four of the offspring have round shells, it is likely that the small-footed parent contributed the dominant round allele for shell shape. Therefore, round must be dominant over lumpy.

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