4sperm cells came from the same parent cell, will they have the same or different chromosomes?

The same.

Explanation:

Because it came from the same parent exactly so you would get an exact replica.

Hope this helps!!

Answer

Each sperm cells contains half of the chromosome from the parents genes.

Explanation:

But a sperm cell contains half the genetics from one parent and an egg contains the half of that parent. But when the sperm fertilizes the egg it combines the genetics.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.