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Standard XII
Biology
Anaphase
Assertion :Tr...
Question

Assertion :Translocation heterozygotes are generally semisterile. Reason: During meiosis in a translocation heterozygote, 50% of gametes carry deficiencies and duplications.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Exchange of genetic material between two non-homologous chromosomes is known as translocation. A translocation heterozygote has translocation in only one of the two sets of chromosomes which hinders the normal pairing of bivalents during meiosis. The subsequent adjacent I and adjacent II segregation of homologous chromosomes produce non-functional gametes while those produced by alternate segregation are functional ones. Therefore, during meiosis in a translocation heterozygote, 50% of gametes carry deficiencies and duplications. Option A is correct answer.

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