If a woman is a carrier for the color-blind recessive allele and her husband has normal vision, what are their chances that a son will be color-blind?

A) none, because the father is normal
B) 50%, since the mother is only a carrier
C) 100%, because the mother has the gene
D) 25%, because the mother is a hybrid
E) None, since the son will also be just a carrier.


50%, since the mother is only a carrier.

Biology & Microbiology

You might also like to view...

A gribble:

a. is the substrate required for kelp to grow on. b. is a snail that crawls along kelp stipes. c. is a group of lobsters. d. is a crustacean that burrows into kelp holdfasts. e. is an echinoderm that consumes kelp.

Biology & Microbiology

When the chromosomes uncoil, the nuclear envelope develops, and the cells divide it is which phase?

What will be an ideal response?

Biology & Microbiology

The proportion of (plasma/leukocytes/RBCs), as determined by a differential white blood cell count, can serve as a sign of disease

What will be an ideal response?

Biology & Microbiology

Early classification systems of the bacteria employed all of the following characteristics except

A. the ability to photosynthesize. B. sporulation or binary fission. C. colony or filament forming. D. motility. E. rRNA sequences.

Biology & Microbiology