In a cross between 2 black Horses a phenotypic ration of 9 black young, 3 brown...

In a cross between 2 black Horses a phenotypic ration of 9 black young, 3 brown young and 4 blond young is observed. Knowing that coat color is determined by two separate, independently segregating loci, what phenomena most likely explains this distribution?

Expert Solution

The given instance depicts the genetics behind the coat colour in horses.

As you know, the coat colour in horses is determined by two separate, independently segragating loci, the first gene is the pigment/colour gene, where the dominant allele is 'B' and the recessive allele is 'b' and the expression of this gene depends on the second gene that regulates the deposition of pigment in the hair. The dominant allele of this gene 'C' codes for pigment formation in the hair while the recessive allele 'c' does not and leads to absence of pigment.

This type of genetic phenomenon involves the interaction between two or more genes that affects the phenotype of an organism. In this case, one gene modifies the phenotype of the second gene. Such genes are epistatic modifier genes and this phenomenon is called 'Epistasis'.

gladiator answered 1 year ago

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