What part of Darwin's theory was incomplete due to a lack of knowledge at the time of publication? How does the
synthetic theory of evolution explain this? What will be an ideal response?
Concepts to Consider: Mendelian genetics provides a mechanism for natural selection;
recent knowledge of fossils that show transitional forms; population genetics; molecular
biology
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Which of the following evidence obtained from fossil studies is generally accepted as marking the beginning of the hominids?
A. large brain development B. walking upright C. bipedalism D. development of lower limbs longer than forelimbs E. manufacture and use of tools
In the biological species concept, it is specified that two organisms are of the same species if they
breed and
a. are unsuccessful in producing offspring. b. produce any offspring. c. produce fertile offspring under laboratory conditions only. d. produce fertile offspring under normal circumstances. e. produce infertile offspring.
Figure 40.2
In the above illustration of fluid regulation in a planarian, the letter "A" represents which of the following?
A. Nucleus of the flame cell B. Small capillaries that allow water to freely diffuse into the planarian C. Sexual reproductive organ D. Cilia to draw fluid into the planarian E. Funnel to collect fluid
In therapeutic cloning, why are the embryonic cells used to treat an individual not rejected by that individual?
A. Because the individual's immune system is suppressed with drugs. B. Because the embryonic cells are cloned from the same individual they are injected into. C. They are rejected, and that is why this has not worked yet. D. Because the cells are embryonic.