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In snail shells the direction of shell coiling is controlled bya maternal effect gene. Two alleles, a dominant one, D, causesdextral (right handed) coiling, and a recessive one, d, causingsinistral (left hand) coiling.

Given three different female snails of genotypes DD, Dd, and dd,crossed with dd males.

What are the phenotypes of the offspring of each

DD females:

Dd females:

dd females:

What are the phenotypes of these females. Explain, based on theprobable parental (both maternal and paternal for each female.(Hint: you may not be able to give definitive answers for each. Ifso explain why in terms of the possible parents.)

DD female:

Dd female:

dd female:

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Lelia Lubowitz
Lelia LubowitzLv2
28 Sep 2019

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