Identify the incorrectly matched pair:
1. Down’s syndrome Trisomy 21
2. Sickle cell anaemia Inherited as an autosomal recessive condition
3. Phenylketonuria Inherited as an autosomal dominant condition
4. Klinefelter’s syndrome 44 Autosomes + XXY
Subtopic:  Mendelian Disorders |
 86%
Level 1: 80%+
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Assertion(A): Color blindness is a sex-linked disorder.
Reason(R): Genes that lead to red-green color blindness are on the X chromosome.

Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Mendelian Disorders |
 88%
Level 1: 80%+
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