Make a sketch showing how nondisjunction in meiosis can result in Down syndrome. What will be an ideal response? What will be an ideal response?
The sketch should show how a gamete can end up with an extra chromosome 21 and should
resemble Figure 16-4 (shown for male gametes) or a corresponding version for female
gametes.
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The two image-forming lenses of a compound light microscope are
(a) the condenser and objective. (b) the condenser and the ocular. (c) the objective and ocular. (d) none of these choices.
Adaptations found in inhabitants of the rocky intertidal zone include:a
soft bodies. b. an anchor or some other means of attachment. c. strong swimming abilities. d. active burrowing. e. delicate outer coverings or bodies.
Many species of which protist group have modified mitochondria that lack functional electron transport chains?
A) excavates B) rhizarians C) ciliates D) unikonts
In the early development of an amphibian embryo, an important "organizer" is located in the
A) neural tube. B) notochord. C) archenteron roof. D) dorsal ectoderm. E) dorsal lip of the blastopore.