The cells of the fruit fly contain 3 pairs of autosomal chromosomes and one pair of sex chromosomes. After meiosis II, how many chromosomes will be present in each gamete?

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Solution

The correct option is E 4
Fruit fly has 3 pairs of autosomal chromosomes and one pair of sex chromosomes, making total 4 pairs (8 chromosomes). Meiosis I involves reduction of chromosome number to half due to movement of homologous chromosomes to opposite poles during anaphase I. After Meiosis II, each gamete will have half the chromosome numbers as that of the somatic cells i.e., total 4 chromosomes.
Therefore, the correct answer is option B.

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