Which distinguishes a morula from a blastula
Presence of more yolk
Absence of yolk
Presence of a cavity
Absence of a cavity
Which event is possible when changes in layer of zona pellucida occurs by sperm at fertilizatioi time?
In sexually reproducing animals the union of male and female gamete forms a cell which is called
Egg undergoes cleavage and forms
Which one of the following statements about human sperm is correct?
The point of sperm entry during fertilization forms