Question

Assume that in apples a single gene controls the color of the apple produced, and the alleles are for red and green apples. If a heterozygote apple tree produces all green apples, which mode of inheritance is most likely?

		Complete dominance
		Incomplete dominance
		Co-dominance

Answer 1

If a heterozygote apple tree produce all the green apples it means that it is showing complete dominance. As mentioned in the question there are only two allele for the colour gene - red and green and if in a heterozygous condition the green allele is able to fully express itself and dominate the red allele it means that the green allele is the dominant allele and it is showing complete dominance.

In case of incomplete dominance we would have observed an intermediate colour between red and green and in case of co dominance both the red and green allele would have been able to completely express itself.