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Question

Which among the following has 23 chromosomes?

A
Spermatogonia
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B
Oogonia
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C
Zygote
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D
Secondary oocyte
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Solution

The correct option is D Secondary oocyte

Spermatogonia

Spermatogonia or the sperm mother cells are diploid (2n) cells having 46 chromosomes.

Zygote

Zygote is formed by the fusion of the sperm (n=23) and egg (n=23) and has 46 chromosomes.

Secondary oocyte

Each primary follicle present in the female ovary consists of a diploid primary oocyte which is arrested at the prophase-I stage of meiosis during embryonic development. Secondary oocyte is a haploid cell which is formed when the primary oocyte completes the first meiotic division after the girl attains puberty. Hence, the number of chromosomes in the secondary oocyte is reduced to half and it contains 23 chromosomes.

Oogonia

Oogonia or the egg mother cell is diploid (2n) and contains 46 chromosomes.

Final answer

c. Secondary oocyte

Secondary oocyte

Each primary follicle present in the female ovary consists of a diploid primary oocyte which is arrested at the prophase-I stage of meiosis during embryonic development. Secondary oocyte is a haploid cell which is formed when the primary oocyte completes the first meiotic division after the girl attains puberty. Hence, the number of chromosomes in the secondary oocyte is reduced to half and it contains 23 chromosomes.

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