You are trying to improve growth in an economically important fish species. Thes

Question

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?

The gene for large size is a maternal effect gene.

The gene for large size is a sex-linked gene.

L and S are incompletely-dominant alleles.

L and S are co-dominant alleles.

The gene for large size is a mitochondrial gene

Explanation / Answer

Maternal gene is a condition where the phenotype of the offspring depends upon the genotype of the mother rather than the environmental conditions it is growing.

So the gene that controls the size of the fish is a maternal effect. If the mother genes are large then large size fish will produce and viceversa.

Hence the correct option is "The gene for large size is a maternal effect"

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