You are trying to improve growth in an economically important fish species. These fish have a gene that controls their size. There are two size alleles; L and S. You cross a large female (LL) with a small male (SS) and get all large fish! The genotypes of the F1 are 100% LS so you assume that large size is dominant to small. You then cross a small female (SS) with a large male (LL) and get all small fish! The genotypes of this F1 are all LS. How do you explain this result?

A. The gene for large size is a maternally inherited.
B. L is dominant to S.
C. The gene for large size is a sex-linked gene.
D. L is not dominant to S.
E. The gene for large size is a maternal effect gene and L is dominant to S.


Answer: A

Biology & Microbiology

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