What phenotypic ratio is expected when a double heterozygote

What phenotypic ratio is expected when a double heterozygote in the cis configuration is crossed with a double heterozygote in the trans configuration and the gene are tightly linked? 3:1 1:1 |2:1:1 1:1:1:1 9:3:3:1

Solution

Answer:

b. 1:1

Explanation:

AB/AB (Cis) X Ab/aB (Trans)

Ab

aB

AB

AB/Ab

AB/aB

1:1

	Ab	aB
AB	AB/Ab	AB/aB