Suppose there was a mutation in the segment polarity genes of Drosophila. What do you suppose might be the outcome?
A) Several segments of the embryo will be missing.
B) Every other segment of the embryo will be missing.
C) Legs will appear in the place of antennae.
D) Antennae will appear in a different part of their usual segment.
Answer: D
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The diploid garden pea plant has 14 chromosomes. The haploid fungus Neurospora crassa has 7 chromosomes. Neither organism has separate male and female individuals. Therefore, the number of linkage groups in these two organisms is:
A. Garden pea has 14 linkage groups, and Neurospora has 7 B. Garden pea has 7 linkage groups, and Neurospora has 7 C. Garden pea has 8 linkage groups, and Neurospora has 8 D. Gardent pea has 15 linkage groups, and Neurospora has 8
The human tailbone is an example of a vestigial structure. A vestigial structure is one that is present in an organism but that has a reduced size and little or no function. For example, the human tailbone is tiny and plays no role in balance or locomotion. In contrast, the tailbone in other animals, such as dogs and cats, is prominent and serves a function. Vestigial structures are used to support the theory of evolution. What type of evidence do vestigial structures represent?
A) fossil evidence B) molecular biology C) comparative anatomy D) biogeography
During a particularly slow afternoon in the lab, you and your colleagues decide to play another round of Whose Heart Is This? The heart you are given has a pair of atria, but only a single, undivided ventricle. What type of animal did this heart belong to before it was given to you?
a. fish b. reptile c. amphibian d. mammal
In some vintage science fiction movies, space travelers find themselves on a planet orbiting a distant star in which there are curious forms of life based on silicon instead of carbon. Although the story clearly is sci-fi, there is an aura of
plausibility in the choice of silicon, an atom with 14 protons, in place of carbon as this alien life-form's central atom. The reason is that silicon: A) has four electrons in its outermost shell. B) is an isotope of carbon. C) is lighter than carbon. D) has one more proton than carbon, so is very similar to it. E) is heavier than carbon.