Joe is color blind. Both his mother and his father have normal vision, but his mother’s father (Joe’s maternal grandfather) is color blind. All Joe’s other grandparents have normal color vision. Joe has three sisters— Patty, Betsy, and Lora—all with normal color vision. Joe’s oldest sister, Patty, is married to a man with normal color vision; they have two children, a 9-year-old color-blind boy and a 4-year-old girl with normal color vision. a. Using standard symbols and labels, draw a pedigree of Joe’s family. b. What is the most likely mode of inheritance for color blindness in Joe’s family? c. If Joe marries a woman who has no family history of color blindness, what is the probability that their first child will be a color-blind boy? d. If Joe marries a woman who is a carrier of the color-blind allele, what is the probability that their first child will be a color-blind boy? e. If Patty and her husband have another child, what is the probability that the child will be a color-blind boy?
Joe is color blind. Both his mother and his father have normal vision, but
his mother’s father (Joe’s maternal grandfather) is color blind. All Joe’s
other grandparents have normal color vision. Joe has three sisters—
Patty, Betsy, and Lora—all with normal color vision. Joe’s oldest sister,
Patty, is married to a man with normal color vision; they have two
children, a 9-year-old color-blind boy and a 4-year-old girl with normal
color vision.
a. Using standard symbols and labels, draw a pedigree of Joe’s family.
b. What is the most likely mode of inheritance for color blindness in Joe’s
family?
c. If Joe marries a woman who has no family history of color blindness,
what is the probability that their first child will be a color-blind boy?
d. If Joe marries a woman who is a carrier of the color-blind allele, what is
the probability that their first child will be a color-blind boy?
e. If Patty and her husband have another child, what is the probability that
the child will be a color-blind boy?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
