Question

1) Suppose that there’s a gene that produces a protein that colors the fur of horses.  There are two alleles of this gene.  One allele produces a functional protein that has a brown color.  The other allele also produces a functional protein, but it has a grey color.  If a horse is heterozygous for this gene, it has the ability to make both “brown fur” proteins and“grey fur” proteins (meaning that its overall fur color looks “muddy”).  Based on this information, you can deduce that the allele that produces the functional “brown color” protein is… (BOLDthe correct answer)

1. recessive to the allele that produces the functional “grey color” protein.
2. dominant over the allele that produces the functional “grey color” protein.
3. incompletelydominant over the allele that produces the functional “grey color” protein.
4. co-dominant with the allele that produces the functional “grey color” protein.

2) Explain your answer to the previous question.

Answer 1

Ans:-C, is the correct option

a) Incorrect, Recessive to the allele that produces the functional "grey color" protein

b) Incorrect,Dominant over the allele that produces the funcional "grey color" protein.

c) Correct,Incompletelydominant over the allele that produces the functional "grey color" protein.

d) Incorrect,Co-dominant with the allele that produces the functional "grey color" protein.

Ans 2) It is incomplete dominance as neither allele is dominant, when they combine they display a new trait by mixing of the two alleles, i.e muddy colour on mixing of brown and grey colour. The both allele blend their effects.