If a man and his wife are both homozygous for a disease-causing recessive gene, then

____________________ of their children will be affected. Fill in the blank(s) with the appropriate word(s).


ANS: all

Biology & Microbiology

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Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer

a. short-day b. long-day c. annual d. biennial e. perennial

Biology & Microbiology

A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?I - The calcium-troponin complex pulls tropomyosin away from the myosin-binding sites of actin.II - The freed-sites of actin bind to myosin to form cross-bridges.III - Calcium ion binds to the troponin.

A. I, II, and III B. III, II, and I C. I, III, and II D. II, III, and I E. III, I, and II

Biology & Microbiology

Pit vipers and boas locate their prey using:a

electroreceptors. b. thermoreceptors. c. specialized olfactory receptors. d. ampullae of Lorenzini. e. lateral line organ

Biology & Microbiology

The ________ is a part of the sperm that contains enzymes that spill out from the sperm and digest through the layers surrounding the secondary oocyte to allow fertilization

Fill in the blank(s) with correct word

Biology & Microbiology