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Question

In Himalayan rabbits, gene C is required for the expression of pigments in the fur, skin, and eye. This species of rabbits typically have a white fur coat except for its colder nose, feet, tail, and ears, which are all black. In an experiment illustrated below, scientists shaved an area of hair on the back of each rabbit (A and B) and then placed an ice pack over the shaved area on one rabbit (rabbit A).

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Based on the results of the experiment, what inference is most likely correct?

External factors, such as temperature, can play a role in how a gene is expressed.
Pigments in fur changes color depending on whether the rabbit is shaved or not shaved.
Gene expression only happens at low temperatures.
DNA is sensitive to cold temperatures and can mutate if exposed to low temperatures for too long.

Answer 1

Based on the results of the experiment involving Himalayan rabbits and the effect of temperature on gene expression, the most likely correct inference is:

External factors, such as temperature, can play a role in how a gene is expressed.

This conclusion aligns with the known characteristics of Himalayan rabbits, where the gene for pigment production is influenced by temperature, resulting in the dark coloration in cooler areas of the body and lighter pigmentation in warmer areas. The other options provided do not accurately reflect the established understanding of gene expression and its relationship with external environmental factors.