The Graafian follicle ruptures to release _________ from the ovary by the process called ovulation.
Primary oocyte
Secondary oocyte after completing meiosis$-II$
Secondary oocyte after completing meiosis$-I$ and with the release of $1^{st}$ polar body
Mature ovum
The disadvantage of parthenogenesis is
Which of the following is true regarding sperm ?
Identify the odd one
In a simplest type of placenta the foetal blood is separated from the maternal blood by six barriers. How many barriers are lost in human placenta
Repressor theory of activation of fertilization was given by