All Calico Cats Are Female Because

question 18

Multiple Choice

All calico cats are female because

• A) two recessive X-linked genes are required for the calico phenotype.
• B) Y-linked genes prevent the expression of the calico phenotype.
• C) the calico phenotype is caused by random X chromosome inactivation.
• D) the calico phenotype is a Y-linked trait.
• E) one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.

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