Discuss the importance of twin and adoption studies to human behavioral genetics research
What will be an ideal response?
Monozygotic twins share identical genotypes and environments, but may have different phenotypes. Dizygotic twins share identical environments, but have different genotypes. Adoption studies separate the variables of environment and genetics; for example, the observation that sons adopted by alcoholic men show a rate of alcoholism closer to that of their biological fathers than that of their adoptive fathers indicates that alcoholism has a genetic component.
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A genetically directed deviation from the average is called
a. an abnormality. b. a disorder. c. a syndrome. d. a carrier. e. a pedigree.
Which natural material seems to be the first used by hominins to make tools?
A) hair B) wood C) feathers D) stones
The child of a mother with IAIA blood and father with IAIB blood will have:
A. 25% chance of being IAIA. B. 50% chance of being IAIA. C. 75% chance of being IAIA. D. 25% chance of being IAIB. E. 50% chance of being IBIB.
Mendel’s dihybrid crosses provided indirect
evidence for all but which one of the following? a. independent assortment b. dominance c. linkage d. presence of two factors in parents and offspring e. segregation of factors