Question

koalas have come close to extinction due to hunting and disease. the current koala populations have very little genetic diversity.
which of the following is a likely result of the low genetic variation in the current koala populations?
choose 1 answer:
a koalas in current populations are more resistant to new diseases.
b the current koala populations are less likely to be able to adapt to environmental changes.
c koalas in current populations are no longer able to successfully breed with other species.
d the current koala population is less likely to be inbred.

Explanation:

• Option A: Low genetic diversity means fewer traits to resist new diseases, so they are less, not more, resistant. Eliminate A.
• Option B: Genetic diversity provides traits for adaptation. Low diversity means fewer adaptive traits, so they are less likely to adapt to environmental changes. This makes sense.
• Option C: Genetic diversity in a population doesn't directly relate to breeding with other species (which is inter - species breeding, and koalas usually breed within their species). Eliminate C.
• Option D: Low genetic diversity in a small population (after near - extinction) actually increases the chance of inbreeding, not decreases. Eliminate D.

Answer:

B. The current koala populations are less likely to be able to adapt to environmental changes.