Microevolution, or evolution at its smallest scale, occurs when
A) an individual's traits change in response to environmental factors.
B) a community of organisms changes due to the extinction of several dominant species.
C) a new species arises from an existing species.
D) a population's allele frequencies change over a span of generations.
Answer: D
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Select all of the layers of the digestive system wall.
A. Submucosa B. Serosa C. mucosa D. muscularis
The proportion of individuals in a population expressing a trait when they have the appropriate
genotype represents the percent of ____________________ for the trait. Fill in the blank(s) with the appropriate word(s).
Which of the following is NOT a common food allergen?
Select one: a. Eggs b. Corn c. Nuts d. Seafood
Which of the following best describes why mapping is most accurate when genes are close together on a chromosome?
A) Double crossover events yield a result that looks the same as no crossover in a two gene mapping experiment and this throws off the calculations. B) This is not true; relative distance of two loci on a chromosome has no effect on accuracy of mapping. C) Double crossover events yield a result that looks the same as one crossover in a two gene mapping experiment and this throws off the calculations. D) The centromere gets in the way. E) This is not true; mapping genes is most accurate when genes are far away from each other.