- #1
Soaring Crane
- 469
- 0
Homework Statement
Dolor and her cousin Largo have conceived a child. They are very concerned about the baby, because they have heard that children of close relatives have a higher incidence of birth defects and/or inherited recessive disorders. They know that their maternal grandmother was a carrier of the Herrera syndrome allele. Assuming that this is the only source of genetic problems for Dolor and Largo, what is the chance that they are both carriers ?
a. 1 in 16
b. 1 in 4
c. 1 in 8
d. 1 in 106
e. 1 in 2
Homework Equations
See below.
The Attempt at a Solution
Each grandchild has ¼ probability of carrying one of four original alleles from grandparents, so the probability of both being carriers is (¼)* (1/4) = 1/16?
Homework Statement
The chance that Dolor and Largo will have a child with Herrera’s
syndrome is
a. 1 in 4
b. 1 in 64
c. 1 in 32
d. 1 in 16
e. 1 in 12
Homework Equations
See below.
The Attempt at a Solution
For the great-grandchild there is a 1/8 probability (of gametes) for getting a recessive allele, so
(1/8) * (1/8) = 1/64?
Thank you for any help.