In reciprocal hybrid crosses, the heterogametic sex is typically sterile while the homogametic sex is not. This phenomenon is referred to as
A) hybrid incompatibility.
B) postzygotic isolation.
C) Haldane's rule.
D) male sterility.
E) None of these
C
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The definition of a generation is _____
A) twenty years B) the average time between a mother's first offspring and her daughter's first offspring C) the average time between a father's first offspring and his son's first offspring D) the average time between parents' first offspring and their child's first offspring
As you transition from sitting in class to riding your bike to your next class, what effect will this have on your metabolic rate and levels of oxygen consumption?
A. Oxygen consumption and metabolic rate will both increase. B. Oxygen consumption and metabolic rate will both decrease. C. Oxygen consumption will increase and metabolic rate will decrease. D. Oxygen consumption will increase and metabolic rate will increase. E. Oxygen consumption and metabolic rate will remain constant.
In animals with a brain, the two major divisions of the nervous system are the ____
a. autonomic and peripheral nervous systems b. central and peripheral nervous systems c. brain and spinal cord d. nerves from the brain and the peripheral nervous system e. cranial and spinal nerves
The organelle that makes steroids in gland cells, regulates calcium in muscle cells, and break down toxins in liver cells is the ___________.
a) lysosomes b) Golgi bodies c) smooth ER d) rough ER