Question

When does the second meiotic division take place in the egg?

Answer 1

Second meiotic division in female egg do not get completed before the entry of sperm.

Hence, second meiotic division takes place after ovulation, inside fallopian tube.

As the sperm head enters egg cytoplasm, second meiotic division proceeds to its final phase, giving out a second polar body.

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The haploid female nucleus generated at the end of meiosis II soon fuses with haploid male nucleus already present in egg cytoplasm and diploid condition is established.

The egg cell is now transformed into a zygote which immediately starts first mitotic division of cleavage.

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