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The first cell to contain the diploid number of chromosomes is:

Correct answer: C. 3

  • A. 1
  • B. 2
  • C. 3
  • D. 4

Explanation

The zygote, formed by the fusion of a sperm and an ovum, is the first cell to contain the diploid number of chromosomes. The sperm and egg are haploid cells, each contributing one set of chromosomes. Upon fusion, the resulting zygote has two sets of chromosomes-one from each parent-making it diploid. This makes the zygote the first diploid cell in the sequence. The other options refer to later stages or cells that do not initially have diploid chromosomes.

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About Chromosomes

Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.

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