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.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.