Consider a chromosome with ordered loci A (A/a), B (B/b), C (C/c), D (D/d), and E (E/e) where the letters in the parentheses indicate the alleles at loci
On a chromosome in which A, C, D, and E are coupling, a new allele arises at the locus B. This new allele B, has a negative effect on fitness. As a result, we would expect:
a. the genetic variation at neighboring loci to decrease.
b. the alleles A, C, D, and E may be lost due to background selection.
c. the alleles A, C, D, and E may be lost due to genetic hitchhiking.
d. A and B.
e. All of the above.
D
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It is possible to remove calcium from compact bone by soaking the bone in vinegar for an extended period of time. Once the calcium is gone, the bone should be
A) more rigid and inflexible. B) about half the size as before soaking. C) extremely flexible. D) completely dissolved.
Which of the following is a product of recombinant DNA technology?
A) rice that produces vitamin A B) bacteria that produce antibiotics C) yeast that produces alcohol D) bacteria that produce acetone E) microbes that digest crude oil
Which part of the seed produces hydrolytic enzymes that break down the starchy endosperm during seed germination?
A. Amyloplasts B. Coleorhiza C. Aleurone layer D. Scutellum E. Plumule
Unlike virtually all other eukaryotes, diplomonads lack mitochondria. Why aren't these organisms considered to represent a state most like the common ancestor to all other eukaryotes?
A. They have nonfunctional mitochondrial remnants. B. They are phototrophic. C. They do not use ATP to power their cells. D. They have endosymbiotic relationships with other bacteria.