Tongue rolling is a dominant trait ( R ). A woman who can roll her tongue is mar
ID: 100210 • Letter: T
Question
Tongue rolling is a dominant trait (R). A woman who can roll her tongue is married to a man who can't. They have two children who are tongue rollers, but one child who isn't. What are the genotypes of the two parents?
the woman is Rr and the man is Rr
the woman is RR and the man is rr
the woman is Rr and the man is RR
the woman is Rr and the man is rr
there isn't enough information in the problem to figure out the genotypes
a.the woman is Rr and the man is Rr
b.the woman is RR and the man is rr
c.the woman is Rr and the man is RR
d.the woman is Rr and the man is rr
e.there isn't enough information in the problem to figure out the genotypes
Explanation / Answer
The women will be Rr and the men will be rr.When the cross take place between this type of genotype than only there is a possibility of the couple having children of both type who can roll their tongue and those who can't roll their tongue.
Male / female R r r Rr ( tongue roller) rr r Rr ( tongue roller) rr