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Sex-linked Inheritance MCQs for Competitive Exams

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Sex-linked Inheritance MCQs for Competitive Exams

Practice with answers, explanations, and exam-focused revision notes.

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Topic Notes: Sex-linked Inheritance

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Quick Overview

Sex-linked Inheritance MCQs in Biology are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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21
What is the specific term for genes that are located exclusively on the Y-chromosome?
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22
Which of the following organisms is a classic example of environmental sex determination, where the sex of the individual is influenced by external factors?
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23
Which specific sex chromosome configuration determines the male phenotype in humans?
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24
Why are males more susceptible to color blindness compared to females?
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25
Evaluate the following assertion and reason regarding haemophilia: Assertion (A): Haemophilia never occurs in women. Reason (R): The gene for haemophilia is located on the X-chromosome.
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26
Evaluate the following: Assertion (A): Humans possess 23 pairs of chromosomes, including one pair of sex chromosomes and 22 pairs of autosomes, and X-linked diseases result from mutations on sex chromosomes. Reason (R): Colour blindness is caused by a mutation on the X-chromosome.
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27
If a phenotypically normal woman, whose father was colourblind, marries a normal man, what is the probability that their sons will be colourblind?
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28
Which parent's genetic contribution determines the biological sex of the offspring?
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29
On which chromosome is the gene responsible for red-green color blindness located?
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30
Which parent is biologically responsible for determining the sex of a human child?
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