Answer:
Oogenesis is different from that of
spermatogenesis in the following aspects
Spermatogenesis
Oogenesis
Sperm generation starts at puberty.
Ooccytes generated before birth.
Many millions generated at a time.
Only one matures at a time every
month.
After two complete divisions, four
equal sized cells produced.
Meiosis-I get arrested at prophase ?I
and when completed at later stage, one big cell with almost all the cytoplasm
and three very small sized cells produced.
They mature into flagellated and
motile cell.
Mature ovum is non-flagellated and
non-motile.
Reasons
(i) Unequal cell division makes the ovum
much larger than the other three polar bodies .Because ovum has more cytoplasm
and more organelles, it has a better chance of surviving.
(ii) The male makes millions of
tiny sperms while, the female makes only one egg per month that also waits for
second meiotic division, until just before fertilization. This is away of
conserving energy.
(iii) Sperm is smaller and
motile as it has to move out of male system to female reproductive system.
Larger egg has abundant reserve food so that embryo starts developing right after
fertilization.
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