Assertion :A single outcross often helps to overcome inbreeding depression. Reason: Out-crossing is best breeding method for increasing milk productivity.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Interbreeding depression is a loss of vigour caused by persistent interbreeding for many generations. It is useful to obtain desirable homozygous traits.
To overcome interbreeding depression, the individual is crossed with a related individual with no recent common ancestor.
Though, the Reason is correct but its is not the correct explanation for the Assertion.
So, the correct option is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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