Human Reproduction · NEET Preparation Zoology
Which event occurs immediately after a sperm enters the secondary oocyte during human fertilisation?
Practice question from Human Reproduction (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-68B676
Which event occurs immediately after a sperm enters the secondary oocyte during human fertilisation?
- A.The secondary oocyte completes meiosis II and forms the ovum and the second polar body.Correct answer
- B.The zygote undergoes implantation in the uterine endometrium.
- C.The sperm nucleus undergoes meiosis to form haploid sperm nuclei.
- D.The embryo immediately differentiates into ectoderm, mesoderm and endoderm.
Solution
Entry of the sperm into the secondary oocyte induces completion of meiosis II. This produces the mature ovum and the second polar body, after which the male and female pronuclei fuse to form the diploid zygote.
More from Human Reproduction
- Which statement correctly describes hormonal regulation of spermatogenesis in human males?
- Which combination of events is characteristic of ovulation in a healthy human menstrual cycle?
- Which hormone secreted by the trophoblast shortly after implantation maintains the corpus luteum during the early stages of pregnancy?
- Which sequence correctly represents the passage of sperm from its site of formation to the duct that carries it toward the urethra?
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