Thalidomide is a non-barbiturate sedative drug which was given to pregnant women. Its use was withdrawn in $1961$ because it resulted in phocomelia. This condition illustrates:

  • A
    Early abortion of foetus
  • B
    Poor development of foetus
  • C
    Malformation of foetus
  • D
    Erythroblastosis foetalis

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$A$: Blastocyst undergoes gastrulation to produce the three germinal layers.
$R$: This involves cell movements (morphogenetic movement) that eventually help to attain new shape and morphology of embryo.

Which of the following structures develops from the ectoderm?

All extra-embryonic membranes:

Most of the major organ systems in the foetus are formed $:-$

In the simplest type of placenta,the foetal blood is separated from the maternal blood by six barriers. How many barriers are lost in the human placenta?

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