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Standard XII
Biology
Sex Determination in Humans
Assertion : I...
Question

Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.

Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.

A
If both assertion and reason are true and reason is the correct explanation of assertion
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B
If both assertion and reason are true but reason is not the correct explanation of assertion
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C
If assertion is true but reason is false
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D
If both assertion and reason are false
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Solution

The correct option is C If assertion is true but reason is false
In human, the gamete contributed by the male determines whether the child produced will be male or female. Sex in humans is a polygenic trait depending upon cumulative effect of some genes present on only the Y-chromosome.

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Q. Assertion :In humans, the gamete contributed by the male determines whether the child produced will be male or female. Reason: Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y - chromosome.
Q. Assertion :In humans the gamete contributed by the male determines whether the child produced will be male or female. Reason: Sex in humans is polygenic trait dependent upon the cumulative effect of some genes on X-chromosome and some on Y-chromosome.
Q. (i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
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(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
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(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
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Q. Assertion: The point O(0, 0) lies in quadrant I.
Reason: The point O(0, 0) lies on both the axes.
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Q. Assertion [A]: Deforestation is one of the main factors contributing to global warming.
Reason [R]: Besides CO2, methane and CFCs are also greenhouse gases.
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