Question

erozygous male i
In humans, the trait for tongue rolling is dominant over the trait for the inability of a human to roll his/her tongue. If a heterozygous male is crossed with a homozygous recessive female, then what percent of the offspring would be expected to have the ability to roll their tongues?s crossed with a homozygous recessive female, then what percent of the offspring would be expected to have the ability to roll their tongues?

Answer 1

50 percent of the offspring would be expected to have the ability to roll their tongues If a heterozygous male is crossed with a homozygous recessive female.

Explanation:

Information given:

the ability to roll tongue is dominant, the genotype would be RR, Rr

the inability to roll tongue is recessive trait the genotype = rr

Given that heterozygous male is crossed with homozygous recessive female, the genotype is

Rr X rr

Punnet square shows that:

    R    r

r   Rr  rr

r  Rr  rr    The genotype ratio is 1:1

                 phenotype ratio is 1:1

There are chances of 50 % offspring having the ability to roll their tongues as they are heterozygous and have the dominant allele for rolling of tongues.