Shell coiling of the snail Lymnaea peregra results from a genetic maternal effec

Question

Shell coiling of the snail Lymnaea peregra results from a genetic maternal effect. An autosomal allele for right-handed shell, s^+, called dextral, is dominant over the allele for a left-handed shell, s, called sinistral. In general, snails are hermaphroditic and reproduce as both males and females. However, a pet snail named Martha is sinistral and reproduces only as a female. From the pedigree above, determine Martha's, her mother's, and her father's genotypes. Place the genotype next to the individuals listed below the pedigree. Martha's genotype Martha's mom's genotype Martha's dad's genotype

Explanation / Answer

martha's genotype= s+s

martha's mom's genotype= ss

martha's father genotype= s+s+

maternal effect is the phenomenon where the nuclear genotype of a mother is expressed in the phenotype of her offspring, unaltered by paternal genetic influence.

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