Question

which of the following represents a scenario that could lead to sympatric speciation?

correct answer(s)

some individuals in a population of flies begin to exhibit a different mating dance.

some individuals in a population of mushrooms that reproduce in the summer begin to reproduce in the spring.

a new group of birds reduces the local density of insects, forcing a population of shrews to compete with mice for nuts.

a stream emerges through a field, separating a population of moles into two populations.

Explanation:

Sympatric speciation occurs within the same geographic area, often due to reproductive isolation (e.g., behavioral, temporal) without physical separation.

• "Some individuals in a population of flies begin to exhibit a different mating dance": Behavioral isolation (different mating behavior) in the same area can lead to sympatric speciation.
• "Some individuals in a population of mushrooms that reproduce in the summer begin to reproduce in the spring": Temporal isolation (different reproductive times) in the same area can lead to sympatric speciation.
• "A new group of birds reduces the local density of insects, forcing a population of shrews to compete with mice for nuts": This is about competition, not reproductive isolation for speciation.
• "A stream emerges through a field, separating a population of moles into two populations": This is allopatric speciation (physical separation).

Answer:

A. Some individuals in a population of flies begin to exhibit a different mating dance
B. Some individuals in a population of mushrooms that reproduce in the summer begin to reproduce in the spring