What is the usual fate of the secondary oocyte if fertilisation occurs in a domestic mammal?
Correct answer: D. It completes meiosis II
- A. It degenerates before pronucleus formation
- B. It begins meiosis I again
- C. It changes directly into a spermatozoon
- D. It completes meiosis II
Explanation
The secondary oocyte is arrested in metaphase of meiosis II and completes this division after sperm penetration. The other options do not describe the normal sequence of oocyte maturation after fertilisation.
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About Theriogenology and Animal Reproduction
Covers the reproductive anatomy and physiology of male and female domestic animals, including puberty, oestrous cycles, ovulation, fertilisation, pregnancy, parturition and lactation. It also includes artificial insemination, semen evaluation, pregnancy diagnosis, infertility, dystocia and reproductive disorders, with attention to species differences.
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