You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. The man has an X-linked recessive form of hemophilia, but the woman does not. Genetic tests
reveal the woman is not a carrier for hemophilia. How should you advise them?
a. Half of their children will have hemophilia.
b. All of their sons and half of their daughters will have hemophilia.
c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia.
d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50%
chance of being carriers.
e. All of their sons will have hemophilia, and all of their daughters will be carriers.
ANSWER: c
You might also like to view...
The process of diffusion requires:
A. a concentration gradient. B. ATP energy. C. the random movement of molecules. D. transport proteins.
If red coat is homozygous dominant in horses
and white coat is homozygous recessive, in a cross between a homozygous dominant redcoated horse and a white-coated horse, what would the result be in the offspring?
a. all homozygous recessive b. all homozygous dominant c. half homozygous dominant and half homozygous recessive d. all heterozygous e. half heterozygous and half homozygous dominant
All of the following are tenets of the cell
theory EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions
An Hfr cell and an F? cell result from conjugation between a donor cell and a recipient cell. Which statement is false regarding this event?
A. The donor could not have been F?. B. The donor could have been either F? or F+. C. The recipient could have been F?. D. The donor could have been Hfr.