MULTIPLE CHOICE Choose the one alternative that best completes the statement or

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MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question. 1) The higher the proportion of locd that are "fixed" in a population, the lower are that population's1) A) chromosome number B) nucleotide variability and average heterozygosity C) nucleotide variability D) average heterozy gosity 2) Use the following information to answer the question below. Researchers studying a small milkweed population note that some plants produce a toxin and other plants do not. They identify the gene responsible for toxin production. The dominant allele (T) codes for an enzyme that makes the toxin, and the recessive allele () codes for a nonfunctional enzyme that cannot produce the toxdin. Heterozygotes produce an intermediate amount of toxin. The genotypes of all individuals in the population are determined (see chart) and used to determine the actual allele frequencies in the population. Allele Frec Is this population in Hardy Weinberg equilibrium? 2) A) No; there are more homozygotes than expected. B) Yes C) No; there are more heterozygotes than expected D) More information is needed to answer this question. 3) A biologist doing a long-term study on a wild spider population observes increased variation in silk thi of the following could the spider population be experiencing? 3) ckness.Which A) disruptive selection B) genetic drift C) stabilizing selection D) directional selection 4) An earthquake decimates a ground squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population. If broadness of stripes is genetically determined, what effect has the ground-squirrel population experienced during the earthquake? 4) A) disruptive selection B) a genetic bottleneck C) a founder event D) directional selection 64% of a remote mountain village can taste phenylthiocarbamide (Pd) and must, therefore, have at least one copy of the dominant PTC taster allele. If this population conforms to Hardy-Weinberg equilibrium for this gene, what percentage of the population must be heterozy gous for this trait?5) A)40% B)48% C)32% D) 16% 6) Which statement about the beak size of finches on the island of Daphne Major during prolonged drought is true? ) Each bird's survival was strongly influenced by the depth and strength of its beak as the 6) drought persisted

Explanation / Answer

1. Option B is correct.
Allele fixing reduces heterozygosity and nucleotide variability.

2. Question is incomplete. The image cannot be seen.

3. Option D is correct.
Directional selection leads to the appearance of one phenotypic end in large numbers.

4. Option B is correct.
Genetic bottleneck refers to a sudden decrease in the size of a population due to environmental events.

5. Option B is correct.
Population that cannot taste PTC, q2 = 36% = 0.36
q = 0.6
p = 0.4
Heterozygotes, 2pq = 2 X 0.6 X 0.4 = 0.48 = 48%

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