Figure 25.1. Use the Following Information When Answering the Following Question(s)

question 4

Multiple Choice

Figure 25.1.
Use the following information when answering the following question(s) .
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 (t) codes for a nonfunctional enzyme that cannot produce the toxin.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.

-Based on whether the population in Figure 25.1 is in Hardy-Weinberg equilibrium,the researchers had already noted that negligible mutation and migration existed in this milkweed population,and the toxin does not affect the butterflies that pollinate these plants.Which of the following would be a logical conclusion about this milkweed population?

• A)Genetic drift and selection are negligible.
• B)There is either a heterozygote advantage or stabilizing selection.
• C)There is either directional selection or sexual selection.
• D)There is either disruptive selection or inbreeding.

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