Formation of segmentation cavity shows

Normally the number of chromosomes in the nuclei of gametes that fuse at fertilization are

The outer layer of the blastocyst which forms the ectoderm is called

Unfertilized egg of human contains or When released from ovary, human egg contains

Which event is possible when changes in layer of zona pellucida occurs by sperm at fertilizatioi time?

What is true about cleavage in the fertilised egg in humans