Class 12 Biology · Chapter 6 · Test 5
Sex-linked Disorders
41 MCQs
40 questions · 15 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Colour blindness is more common in males because it is a/an:
- AAutosomal trait
- BX-linked dominant trait
- CX-linked recessive trait
- DY-linked trait
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Answer: C
Males need only one recessive allele on the X chromosome to show the trait.
Question 2
If a mother has an X-linked recessive trait then:
- AAll her sons will have it
- BHalf her sons will have it
- CNone of her sons will have it
- DOnly daughters have it
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Answer: A
Sons receive her X chromosome.
Question 3
If a mother is a carrier of an X-linked recessive trait then about what percentage of her sons can inherit it?
- A25%
- B50%
- C75%
- D100%
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Answer: B
Half of her X chromosomes carry the allele.
Question 4
If an X-linked recessive trait is present in the father then:
- AAll daughters are carriers and no son inherits it
- BAll sons inherit it
- CNo daughter is a carrier
- DHalf the sons inherit it
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Answer: A
Sons do not inherit their father's X chromosome.
Question 5
Which is an example of an X-linked recessive trait?
- AMuscular dystrophy
- BRett syndrome
- CHypertrichosis
- DVitamin D-resistant rickets
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Answer: A
Other examples are haemophilia and red-green colour blindness.
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