Explain the steps in the formation of an ovum from an oogonium in humans.
or " "
Suggest and explain any three Assited Reproductive Technologies (ART) to an infertile couple.

Explanation

With special techniques called assisted reproductive technologies, infertile couple could be assisted to have children.
ART includes i) In-Vitro Fertilisation (IVF): It is transfer of an ovum collected from a donot into the fallopian tube of another female for fertilisation and further development
ii) Zygote Intrafallopian Transfer (ZIFT): Ova from (female) and sperms from husband/donor (male) are collected and are induced to form zygote under simulated conditions in laboratory. The Zygote with upto 8 blastomeres is then transferred into the fallopian tube.
iii) Intra Cytoplasmic Sperm Injection (ICSI): Here the sperm is directly injected into the ovum.