If there are 12 chromosomes in an animal cell in interphase of the cell cycle, what is the diploid number of chromosomes for this organism?

A) 6
B) 24
C) 36
D) 12
E) 48

To determine the diploid number of chromosomes for an organism, we need to know the number of chromosomes in its somatic cells.

Given that there are 12 chromosomes in an animal cell during interphase, we can assume that this is the number of chromosomes in its haploid set (n).

The diploid number of chromosomes (2n) is double the haploid number. Therefore, to calculate the diploid number, we multiply the haploid number by 2.

In this case, the diploid number of chromosomes for the organism can be calculated as follows:
2n = 2(12) = 24.

Therefore, the correct option is B) 24.