Assertion: The strength of linkage will be more when the distance between two genes is greater.
Reason: Crossing over will be relatively less frequent.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

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If both the assertion and reason are true but the reason is not a correct explanation of the assertion

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If the assertion is true but the reason is false

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If both the assertion and reason are false

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If the assertion is false but reason is true

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Solution

The correct option is D If both the assertion and reason are false
The strength of linkage will be determined by the distance between two genes. The greater this distance, lower will be the linked strength. Crossing over will be relatively more frequent, if distance between two genes is more than in a case where the distance between genes is less. Therefore, both assertion and reason are false.
So, the correct answer is 'If both the assertion and reason are false'

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