What are these structures in the picture above

What are these structures in the picture above?

The structures are the male and female chromosomes which are made up of a pair of allele each, female chromosome with XX while male with XY chromosome

Explanation:

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.

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