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Explain why it is unusual for Calix to be a male calico cat?

Question

Explain why it is unusual for Calix to be a male calico cat?

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Solution

Calico cats are known for their distinctive tri-color coat pattern, which typically includes white, black, and orange patches. The genetic basis for this coloration is linked to the X chromosome. Here's why it is unusual for Calix to be a male calico cat:

Step 1: Define the Problem

Identify why male calico cats are rare.

Step 2: Break Down the Problem

  1. Genetic Basis of Calico Coloration: The calico pattern is due to the presence of two different alleles for fur color located on the X chromosome.
  2. Chromosomal Differences in Cats: Female cats have two X chromosomes (XX), while male cats have one X and one Y chromosome (XY).

Step 3: Apply Relevant Concepts

  • X-Inactivation: In female cats, one of the X chromosomes is randomly inactivated in each cell, leading to the expression of different color alleles in different cells, resulting in the calico pattern.
  • Male Chromosomal Limitation: Since male cats typically have only one X chromosome, they usually cannot have both alleles necessary for the calico pattern.

Step 4: Analysis, Verify and Summarize

  • Genetic Anomaly: For a male cat to be calico, it must have an extra X chromosome, resulting in an XXY configuration. This condition is known as Klinefelter syndrome in humans and is rare in cats.
  • Rarity: The occurrence of XXY male cats is rare, which is why male calico cats like Calix are unusual.

Final Answer

Male calico cats are rare because the calico coloration requires two X chromosomes, which is typical in females (XX). Male cats usually have one X and one Y chromosome (XY), so a male calico cat must have an atypical XXY chromosomal configuration, making it a rare genetic anomaly.

This problem has been solved

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