When released from ovary, human egg contains
$One\; Y-chromosome$
$Two\; X-chromosomes$
$One\; X-chromosome$
$XY-chromosomes$
The graafian follicle ruptures to release the secondary oocyte (ovum) from the ovary by the process called.....
The permeability of the human placenta to macro-molecules is evidenced by the presence of following in foetal blood
During the fourth and sixth cleavage of the zygote
In frog chromosome no. is reduced to half
During embryonic development, the establishment of polarity along anterior/ posterior, dorsal/ventral or medial/lateral axis is called