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Chromosomes

In a certain ...

Question

In a certain species of insects, some individuals have 17 and some have 18 chromosomes. The 17 and 18 chromosomes bearing individuals are and respectively.

A

males, females

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B

females, males

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C

nymphs, adults

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D

adults, larvae

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Solution

The correct option is A males, females
Sex determination in insects is of XO type in which males have autosomes + XO chromosomes and females have autosomes + XX chromosomes. So, here males must be 16 + XO and females 16 + XX.

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