Question

1. When homozygous white cattle are crossed with homozygous red cattle, each of the offspring has a
mis of white and red hairs. This blend of colors is called roan. What can you infer about the pattern
of inheritance involved in the formation of a roan coat in cattle? Explain your answer.

Answer 1

Answer:

When homozygous white cattle are crossed with homozygous red cattle, each of the offspring has a  mix of white and red hairs. This blend of colors is called roan. What can you infer about the pattern  of inheritance involved in the formation of a roan coat in cattle?

WW x RR= WR, WR, WR and WR

WW= Homozygous white cattle

RR= Homozygous red cattle

WR= Roan (Mix of red and white cattle)

WR x WR= WW, WR, WR and RR

When the roan cattle (WR) is crossed with one another, the offspring produced gives a mix of white and red cattle (75%) and homozygous red cattle (25%).

Explanation:

Answer 2

If when homo-zygous white cattle are crossed with homo-zygous red cattle, offspring have a mix of white and red hairs, then it is a case of codominance.

• Diploid organisms (such as cattle) inherit two gene forms or 'alleles' for a given gene locus, one from each parent.

• An individual is homo-zygous when inherits the same alleles for a given gene locus, whereas an individual is heterozygous when inherits different alleles for a given gene locus.

• In cases of codominance, both alleles are expressed in heterozygous individuals, thereby forming a phenotype that is different from parental phenotypes in a double homo-zygous cross.

In conclusion, if when homo-zygous white cattle are crossed with homo-zygous red cattle, offspring have a mix of white and red hairs, then it is a case of codominance.

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