What might happen if the gametes of a species had
the same number of chromosomes as the species'
body cells?

The chromosome number will not be constant and the person would  die.

Meiosis is the type of cell division that occurs during  reproduction. In

this type of division, the result is the formation of two unique daughter

cells.

Mitosis on the other hand is the cell division concerned with growth and

replacement of worn out tissues in the body.

In instances where the gametes of a species had the same number of

chromosomes as the species' body cells, the species formed will have a

chromosome number which isn't constant which may result in death due to

issues occurring during replication.

Read more about Cell division here link

The chromosome number will not be constant and the person would die.

Explanation:

During gamete formation, half of the chromosomes arise from one parent and the other half from the other parent. This is possible due to the process of meiosis.

If during gamete formation, the number of chromosome does not get reduced, then after fertilization the gamete will have double the number of chromosomes as compared to the parents. Hence, the chromosome number of the person will not remain constant and he/she would die.

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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.