Question

which are the events of meiosis in the human life cycle?choose all that apply.
a chromosome number remains 46
b sperm or ova are created
c four haploid cellsare created
d homologous chromosome pairs cross over (swap bits)

Explanation:

• Option A: In meiosis, the chromosome number is halved (from diploid to haploid). Human diploid cells have 46 chromosomes, and after meiosis, haploid cells (gametes) have 23 chromosomes. So this option is incorrect.
• Option B: Meiosis in humans occurs in the gonads (testes for sperm production in males and ovaries for ova production in females). So sperm or ova are created through meiosis. This option is correct.
• Option C: Meiosis involves two - division steps (meiosis I and meiosis II). Starting from one diploid cell, after meiosis I (reductional division) and meiosis II (equational division), four haploid cells are formed. This option is correct.
• Option D: During prophase I of meiosis, homologous chromosome pairs undergo synapsis. Non - sister chromatids of homologous chromosomes can cross - over (swap bits of genetic material), which leads to genetic recombination. This option is correct.

Answer:

B. sperm or ova are created, C. four haploid cells are created, D. homologous chromosome pairs cross over (swap bits)