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Structure of Homologous Chromosomes

A diploid som...

Question

A diploid somatic cell of rat has a total of 42 chromosomes (2n = 42). What will be the number of DNA molecules in anaphase of mitosis?

A

84

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B

42

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C

21

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D

None of these

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Solution

The correct option is A
84

Calculation of number of DNA molecules: as per question the somatic cell has 42 chromosomes. In a cell at rest number of chromosome is equal to number of chromosomes. In G2 phase DNA replication occur so the number of DNA becomes 84. Which remains constant till anaphase of mitosis after cytokinesis it is restored to 42.

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