BIOLOGY HIGH SCHOOL

N snails, the shell may either coil to the right or the left. coiling to the right is dominant. a homozygous recessive female snail is crossed with a homozygous dominant male snail. all of the offspring have shells that coil to the left. why do all of the offspring have left-coiled shells

Answers

Answer 1
Answer: So first off homozygous means that both alleles are the same
If coiling to the right is dominant and to the left is recessive let capital c (C) represent right coiling and let lower case c (c) represent left coiling.
The female who is homozygous recessive must have both recessive alleles
The male who is homozygous must have two dominant alleles
So the cross will be between a CC and a cc
So we set up a Punnett square

We take a look at all the combinations and arrange them


So we find that there is a 25% chance of the offspring having left coiling
Answer 2
Answer:

The coiling direction of the snail shell is affected by the maternal genes. All the offspring have left-coiled shells, as the phenotype is determined by the mother's genotype. Thus, option C is correct.

What is maternal inheritance?

Maternal inheritance has been defined as the effect by which the genes are influenced by the mother's genotype and are a type of non-Mendelian inheritance.

The dextral and the sinistral coiling seen in the snails showing the maternal effect is influenced by the genotype of the mother and is not affected by the father's genotype.

The mother has the cc and the father has the CC genes that when crossed are shown in the image.

From the cross, it is evident that the genotype of the mother snail affects and influences the genotype of the offspring, and hence all the offspring's have the left coiling (sinistral).

Therefore, in option C, the genotype of the mother snail affects the coiling.

Learn more about maternal inheritance, here:

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Your question is incomplete, but most probably your full question was,

All of the offspring have shells that coil to the left. Why do all of the offspring have left-coiled shells?

A. This trait follows a typical Mendelian pattern of inheritance.

B. Only the father's genotype determines the phenotype for shell coiling.

C. Only the mother's genotype determines the phenotype for shell coiling.

D. Shell-coiling is a sex-linked trait.

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Answers

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Answers

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Answers

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