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The following image is of a Siamese cat - VCE - SSCE Biology - Question 22 - 2011 - Paper 1
Question 22
The following image is of a Siamese cat. The colour produced in the fur of a Siamese cat is under the control of a tyrosinase enzyme that is sensitive to particular... show full transcript
Worked Solution & Example Answer:The following image is of a Siamese cat - VCE - SSCE Biology - Question 22 - 2011 - Paper 1
Step 1
It is likely that in Melbourne:
Answer
D. Siamese cats that live outside in winter have darker fur than Siamese cats in tropical regions.
Explanation
Siamese cats exhibit temperature-sensitive pigmentation due to the action of the tyrosinase enzyme. When the temperature is below 37°C, pigment is produced, leading to the darker fur typically observed in colder regions.
Siamese cats that reside outdoors during winter experience lower temperatures, promoting the expression of darker fur. In contrast, those in tropical climates may not show the same pigmentation due to consistently higher temperatures, which inhibit pigment production.