Incest avoidance evolved in humans:
a. because breeding among close relatives leads to a higher proportion of offspring with genetic defects and, consequently, reduced fitness.
b. as part of a larger fixed action pattern.
c. because many bees, wasps, and ants can inflict painful, and even fatal, stings and bites.
d. because in early human societies, alliances could be achieved by marrying the chief's daughter to the son of the chief of a different tribe.
e. because breeding among close relatives leads to a higher proportion of offspring with increased fitness.
Answer: a. because breeding among close relatives leads to a higher proportion of offspring with genetic defects and, consequently, reduced fitness.
You might also like to view...
Which of the following are referred to as mononuclear phagocytes?
A. Lymphocytes and basophils B. Mast cells and eosinophils C. Basophils and eosinophils D. Monocytes and macrophages
In humans, skin color is controlled by several genes. Thus, skin color is a(n) ____ characteristic.
a. dominant b. co-dominant c. epistatic d. pleiotropic e. recessive
Temporal gene regulation refers to which of the following circumstances?
a. Certain genes are induced only at a particular point in the life cycle. b. Certain genes are induced only in specific tissues. c. Heat-shock genes are induced during periods of temperature stress. d. "Housekeeping" genes are induced in response to a viral infection. e. Molecular chaperones are synthesized after heavy-metal ingestion
The flow of energy during the three phases of energy metabolism is controlled by what two pancreatic hormones?
What will be an ideal response?