A sperm has just fertilised a human egg in the fallopian tube. Trace the events that the fertilised egg will undergo up to the implantation of the blastocyst in the uterus.

What is the number of chromosomes in the following cells of a human male?

1. Spermatogonial cells.
2. Spermatids.
3. Primary spermatocytes.
4. Sertoli cells.

Write the function of each of the following:
Acrosome of human sperm.

Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.

List the three hormones produced in women only during pregnancy. What happens to the levels of estrogen and progesterone during pregnancy?

What is the number of chromosomes in the following cells of a human male?
Primary spermatocytes.

How does the female gamete reach the uterus from ovary?

Draw a labelled diagram of sperm.

On the basis of the functions mentioned below, identify each one correctly.

1. It helps in the movement of spermatozoan in a fluid medium.
2. It contains hydrolytic enzymes and is used to contact and penetrate the egg during fertilisation.

Mention the target cells of luteinising hormone in human males and females. Explain the effect and the changes which the hormone induces in each case.