A mutation in a collagen gene is likely to affect the phenotype because
A) it is extremely rare.
B) during meiosis, the chromosome that bears the mutation is more likely to enter a gamete than the chromosome that carries the wild type allele.
C) collagen has a very precise three-dimensional structure, so nearly any disruption alters the overall conformation.
D) people who use cosmetics with collagen silence collagen genes.
C) collagen has a very precise three-dimensional structure, so nearly any disruption alters the overall conformation.
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An acceptable specimen for anaerobic culture is:
a. nasopharyngeal swab. b. tissue obtained at biopsy. c. small bowel contents. d. catheterized urine.
Both the largest and fastest invertebrates are in which mollusk group?
a. chitons b. cephalopods c. gastropods d. bivalves e. cnidarians
Meiosis may pause at which point in the cycle?
a. after DNA is replicated in S phase but before meiosis I begins b. after meiosis I is complete c. after prophase II d. before telophase II e. after prophase I
You have several hives of honey bees, Apis mellifera , that you keep in your backyard. Some bees uncap and remove dead larvae from cells, while others leave dead larvae in the cells; this difference is genetically determined. After a particularly hot summer in which many bees die from disease, you notice that the only hives remaining are the ones in which bees uncap and remove dead larvae. You have witnessed:
a) a population-level change in allele frequency. b) a population-level change in the frequency of a behavioral trait. c) evolution has not occurred, only bad weather. d) Only a) and c) are correct. e) a), b), and c) are all correct.