The chromosomal designation for a human male is
A. XX.
B. XO.
C. XY.
D. YY.
E. XXX.
C. XY.
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Pheromones are used primarily for
a. signaling target cells in the vicinity of the secreting cells. b. stimulating transmitter release at certain synapses. c. integrating social behavior in a population. d. causing a response in a part of the body some distance from the site of secretion. e. all of these, depending on the species.
Darwin's geometric ratio of increase pertains specifically to
A. the inheritable variations found in a population. B. the inheritance of acquired traits. C. the overproduction potential of a species. D. the artificial selection of traits in plants or animals.
In what structure does inhaled air complete its path to the lungs?
A) Bronchi B) Bronchioles C) Glottis D) Alveoli E) Larynx F) Pharynx
What is the structure that holds the chromatids together?
A) centromere B) chromatin C) chromosomes D) karyotype E) none of these