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Goryan
17 days ago
11

A maternal effect can cause the offspring phenotype ratio to depart from that of classic Mendelian inheritance. In a species of

snail, the dominant allele N codes for right-handed shell coiling and recessive allele n codes for left-handed shell coiling. If an Nn female with right-handed shell coiling males with an Nn male, what is the shell coiling phenotypic ratio of their offspring?
a. 4 right-handed coil:0, left-handed coil
b. 3. Right-handed coil: 1.left-handed coil
c. 3.bidirectional coil: 1.left-handed coil
d. 0.right-handed coil: 4.left-handed coil

Biology
1 answer:
enyata [2.5K]17 days ago
8 0

Response:

A) 4 right-handed coils: 0 left-handed coil

Clarification:

Referring to the MENDELION CROSS:

We can observe NN, Nn, Nn, nn

NN, Nn, and Nn represent the 3 instances of right-handed coiling while nn denotes left-handed coiling.

In the case of shell coiling in snails, maternal inheritance plays a role, where the phenotype alone determines the offspring's traits.

Maternal traits: Since the female parent possesses right-handed shell coiling, all offspring will inherit this characteristic.

Thus, the observable phenotypic ratio is:

4 Right-handed coils: 0 Left-handed coils

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