1. In humans, right-handedness (R) is dominant to left-handedness (r), and brown eyes (B) are usually dominant to blues eyes (b).
a) What are the genotypes of gametes produced by a person heterozygous for both traits?
b) What are the genotypes of gametes for a person heterozygous for brown eyes, but homozygous recessive for left-handedness?
c) Set up a Punnett square for a couple that is heterozygous for both traits. What is the probability that if their first child is brown-eyed and left-handed that the second child is blue-eyed and left-handed?
d) A right-handed, blue-eyed woman marries a right-handed, brown-eyed man. They have two children, one left-handed and brown-eyed and the other right-handed and blue-eyed. By a later marriage with another man, who is also right-handed and brown-eyed, she has seven more children, all of whom are right-handed and brown-eyed. What are the genotypes of the woman and her two husbands?
1. In humans, right-handedness (R) is dominant to left-handedness (r), and brown eyes (B) are usually dominant to blues eyes (b).
a) What are the genotypes of gametes produced by a person heterozygous for both traits?
b) What are the genotypes of gametes for a person heterozygous for brown eyes, but homozygous recessive for left-handedness?
c) Set up a Punnett square for a couple that is heterozygous for both traits. What is the probability that if their first child is brown-eyed and left-handed that the second child is blue-eyed and left-handed?
d) A right-handed, blue-eyed woman marries a right-handed, brown-eyed man. They have two children, one left-handed and brown-eyed and the other right-handed and blue-eyed. By a later marriage with another man, who is also right-handed and brown-eyed, she has seven more children, all of whom are right-handed and brown-eyed. What are the genotypes of the woman and her two husbands?
