Question

A woman who is a nontongue roller marries a man that is heterozgyous for rolling his tongue. What percent of the children will be able to roll their tongue? Image result for tongue rolling genetics Tongue Rolling is a dominant trait (actually this is a myth described by Alfred Sturtevant, genetist in 1940- we will just go with it).

a 100%
b 75%
c 50%
d 25%
e 0%

Answer 1

Answer: C) 50%

Explanation: The information provided shows that tongue rolling is dominant while non tongue rolling is recessive. Let R represent the allele for tongue rolling and r represent the allele for non tongue rolling, therefore a man who is heterozygous for tongue rolling will have a genotype Rr and a woman who is a non tongue-roller will have a genotype of rr. A cross between them will produce offsprings with genotypes Rr and rr. Rr is being heterozygous for tongue rolling while rr is being a non tongue roller. Fifty percent of the offsprings will be tongue rollers while fifty percent will be non tongue rollers.

See the punnett square attached

Answer 2

The answer to your question is letter C. 50%

Step-by-step explanation:

According to the information given we know that non-tongue rolling a recessive trait and tongue rolling is a dominant trait so

For the woman, we have tt the woman is homozygous

and for the man, we have Tt the man is heterozygous

Punnet's square

T t

t Tt tt

t Tt tt

50% of the children would be able to roll the tongue

50% of the children would not be able to roll the tongue