Question

Imagine that the head shape is controlled by a maternal effect gene. The dominant h+ allele...

Imagine that the head shape is controlled by a maternal effect gene. The dominant h+ allele produces an oval-shaped head, while the recessive h allele produces a square head. Imagine that a woman has a square head. Her father has the h+ h+ genotype. What proportion of head phenotypes do you expect to see in her children?

Please provide explanation.

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Answer #1

Answer :-

Given :- head shape is controlled by a maternal effect gene.

I.e allele inherited from mother will decide the phenotype of resultent offspring irrespective of allele form father .

Let h+ - dominant allele - results in ovale head.

And h = recessive allele - resulted in square head

Solution :

A woman has a square head and has a father with genotype h+h+ .This suggest that she must be heterozygous for genotype and inherited allele h from her mother that resulted her square shaped head.

She is heterozygous for genotype i.e her genotype is h+h

That is probability of passing each allele to her offspring is 50%

Therefore ; proportion of offspring with ovale head will be 50%

And proportion of offspring with square head will be 50%.

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