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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At how many degrees north and south of the equator does air rise again as a result of different temperatures in air masses that meet?
a. 10 b. 30 c. 40 d. 60 e. 75
Which of the following events is not associated with the development of the female gametophyte?
A. A single parenchyma cell will enlarge to become a megaspore mother cell. B. The female gametophyte will contain three antipodal cells. C. The nucleus of the megaspore divides mitotically to produce eight nuclei. D. The megaspore undergoes meiosis producing four haploid megaspores. E. All of these are associated with the development of the female gametophyte.
Which of the answer choices is not considered to be a part of the endomembrane system?
A) mitochondria B) Golgi C) plasma membrane D) lysosome E) endoplasmic reticulum
Zero population growth is achieved when ____.
A. a population starts to decline B. emigration and immigration are balanced, and the number of births equals the number of deaths C. births exceed deaths D. deaths exceed births E. emigration and immigration are prevented