In a beetle species the red color is dominant over the white color. what is the genotype of any red beetle resulting from this species? 1points a red and white alleles present on one chromosome b red and white alleles present on two chromosomes c a red allele present on both homologous chromosomes d a red allele present on at least one of two homologous chromosomes

Option D, A red allele present on at least one of two homologous chromosomes

Explanation:

It is given that in a beetle species the red color is dominant over the white color. Thus, in order to have a offspring of red color at least one of the two homologous chromosome must have red allele.

This can be further understood from the cross below -

Suppose one of the parent is homozygous red  with genotype "RR" and other parent is homozygous white with genotype "rr"

If a cross is carried out between the two parents, the following offsprings will result -

RR x rr

Rr, Rr, Rr, Rr

Since there is no co dominance, thus the dominant allele will express itself completely and hence at least one of the homologous chromosome of  offspring must have red color allele.

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