Hemophilia A is an X-linked recessive disorder. If a normal man marries a woman who is a carrier, what fraction of their sons will have hemophilia? Select one:

a. 0%
b. 75%
c. 50%
d. 100%
e. 25%


c. 50%

Biology & Microbiology

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In humans, the thirst center is located in the

a. adrenal cortex. b. hypothalamus. c. anterior pituitary. d. glomerulus

Biology & Microbiology

The ear drum/ tymanic membrane ____ when sound waves hit it.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The recent increase in atmospheric carbon dioxide has produced ________, according to the textbook and most scientists

Fill in the blank(s) with correct word

Biology & Microbiology

Describe telophase (Select all that apply)

a. sister chromatids cluster on each side of the cell b. chromosomes align along the center of the cell c. DNA is replicated d. centrioles migrate to the poles of cell e. a nuclear envelope reappears

Biology & Microbiology