Gray rooster and a gray hen produce 15 gray, 6 black, and 8 white hens. What is

Question

 Gray rooster and a gray hen produce 15 gray, 6 black, and 8 white hens.
 What is the mostlikely pattern of inheritance for this character?

 How do these results support the theory thatinheritance is particulate (i.e. Mendelian) as opposed to blending (i.e. pre-Mendelianinheritance theory)?

9) When comparing mitochondrial DNA from related species, every third nucleotide is more likelyto differ than the other two, e.g. AATGCG and AACGCA.
 Why is it that the third nucleotide ismore frequently mutated than the first two?

Explanation / Answer

1)The pattern of inheritance is incomplete dominance or codominance. This does not obey Mendel's concept of dominance where one of the allele of a gene completely dominates the other and thus is expressed, producing only two alternatives of the character.

Here gene B is for black and b for white

Therfore BB is black.Bb is gray and bb is white

15 gray, 6 black, and 8 white hens represents 2:1:1 ration found in incomplete dominance and codominance.

2)The changes in the third nucleotide usually results in the coding of the same aminoacid and thus producing the same protein and same phenotype.This is called silent mutation which is usually neutral as it brings no effects in evolution. But it is found to bring changes in splicing and protein folding

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