One population of Pacific northwest garter snakes live in coastal forests, where it hunts the banana slugs common on the forest floor. The other population lives inland, where there are no banana slugs. Inland snakes eat fishes and tadpoles. When researchers offered a slug to newborn garter snakes, offspring of coastal snakes ate it, but offspring of inland snakes ignored it. How did researchers
prove that the two populations differed in their genetic inborn food preferences?
What will be an ideal response?
It was hypothesized that inland snakes lack the genetically determined ability to associate the scent of slugs with food. Therefore, the researchers bred the two snake populations. When coastal garter snakes were crossed with inland snakes, the resulting offspring made an intermediate response to slugs. Results from the experimental crosses confirmed that the inborn food preference was genetic.
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Using the drawing of mRNA below, choose the letter that best fits the description. Translation is often regulated by sequences in this region. ____
What will be an ideal response?
Two species of Gelsemium spp., a flowering vine plant, share the same habitat and have similar insect pollinators. However, pollination occurs for Gelsemium semperviren from mid-January to late March, and for Gelsemium rankinii from late March to mid-April. This represents
A. gametic isolation. B. a process analogous to behavioral isolation in animals. C. temporal isolation. D. ecological isolation. E. mechanical isolation.
Which of the following occurs in prophase?
a. sister chromatids attach b. DNA replicates c. chromosomes align in the middle of the cell d. the nuclear envelope breaks down e. sister chromatids separate
Which of the following is/are likely to limit the maximum size of a cell?
a. the time it takes a molecule to diffuse across a cell b. the cell's surface-to-volume ratio c. the shape of the cell d. all choices are correct e. none of the choices are correct