A geneticist testcrosses a dihybrid (heterozygous for two genes) mouse and notices the double dominant and double recessive phenotypes are present at 8% and 10% frequency, respectively. Which of the following is the best conclusion from these data?
(A) The dominant allele of one gene is linked to the recessive allele of the other, and the two genes are approximately 20 map units apart.
(B) The dominant alleles of the two genes are linked and the two genes are 80 map units apart.
(C) The recessive alleles of the two genes are approximately 20 map units apart and are not linked.
(D) The two genes are linked and 80 map units apart, but it cannot be determined which alleles are being inherited together.
correct answer bolded. explain?
(A) The dominant allele of one gene is linked to the recessive allele of the other, and the two genes are approximately 20 map units apart.
(B) The dominant alleles of the two genes are linked and the two genes are 80 map units apart.
(C) The recessive alleles of the two genes are approximately 20 map units apart and are not linked.
(D) The two genes are linked and 80 map units apart, but it cannot be determined which alleles are being inherited together.
correct answer bolded. explain?