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Himalayan Rabbit Environment Experiment

- Raised at 15 °C
- Color of body: white
- Color of ears, feet, and nose: black

- Raised at 35 °C
- Color of body: white
- Color of ears, feet, and nose: white

Which statement describes the way the environment affects the expression of the black color gene?

A. Rabbits raised in a cooler environment express the black color gene on their bodies.
B. Rabbits raised in a cooler environment express the black color gene on their ears, feet, and nose.
C. Rabbits raised in a warmer environment express the black color gene on their bodies.
D. Rabbits raised in a warmer environment express the black color gene on their ears, feet, and nose.

Answer :

Final answer:

The Himalayan rabbit's color variation is influenced by temperature, leading to black coloration only in cooler parts of its body. In cooler environments, the enzyme producing melanin functions effectively, while in warmer settings, the enzyme becomes inactive. Thus, the correct statement reflects that rabbits raised in cooler conditions express the black color gene on their extremities.


Explanation:

Understanding Temperature-Dependent Coloration in Himalayan Rabbits

The Himalayan rabbit exhibits a unique case of temperature-sensitive pigmentation according to its environment. When raised at cooler temperatures (15 °C), the black color gene expresses itself on the extremities of the rabbit, including the ears, feet, and nose. This occurs because the enzyme responsible for pigment production, tyrosinase, functions correctly at lower temperatures but becomes inactive at the higher temperatures of the rabbit's main body, resulting in a predominantly white body.

Thus, the most accurate statement regarding how the environment affects the expression of the black color gene in these rabbits is:

  1. B. Rabbits raised in a cooler environment express the black color gene on their ears, feet, and nose.

In contrast, when the rabbits are raised in warmer environments (35 °C), they do not express the black color at all, as the higher temperatures denature the enzyme and prevent melanin production.

Conclusion

Understanding this phenomenon illustrates how environmental factors can guide genetic expression, further explaining why rabbits in cooler climates maintain darker extremities while adapting to warmer surroundings results in a lighter phenotype.


Learn more about temperature-sensitive pigmentation here:

https://brainly.com/question/35368388


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