If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is
a. diploid.
b. unable to undergo meiosis.
c. haploid.
d. none of the above.
c
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The bacterium Bacillus tumefaciens has been harnessed in biotechnology because it can insert a gene from one species of plant into another. This can also occur in nature and is referred to as
A. vestigial transfer. B. homology. C. horizontal gene transfer. D. vertical evolution. E. exon shuffling through endocytosis.
Which of the following serves as a protective layer around mammalian eggs?
a. zona pellucida b. lysosome c. seminiferous tubule d. endoderm
The differential survival rates associated with birth weights in Figure 19-5 illustrate:
a. balanced polymorphism.
b. genetic drift.
c. neutral variation.
d. stabilizing selection.
e. disruptive selection
During Hurricane Marilyn, 15 green iguanas were blown out to sea from the island of Guadalupe. They floated on mats of vegetation for several weeks until they landed on the island of Anguilla. If these green iguanas evolve reproductive barriers and become a new species, this would be an example of:
A) allopatric speciation B) sympatric speciation C) postzygotic barrier D) a miracle E) none of the above