The mature form of a newly discovered species of eukaryote contains 12 chromosomes and exists in
the diploid state. in this new species. how many chromosomes are present in a mitotic cell immediately
after the sister chromatids have separated?

12 chromosomes

Explanation:

In mitosis the daughter cells finish up with exactly the same number of chromosomes as the parent cell. This is called the diploid condition where the nucleus of each cell contains a pair of each type of chromosome.

The sister chromatids of each chromosome separate at the centromere forming two distinct daughter cells. The eukaryote has 12 chromosomes and exists in diploid state therefore after mitosis, the number of chromosomes will be retained as that of the parent.