If an organism is diploid and has 60 chromosomes in its normal cells, it will have 30 chromosomes in each cell produced by mitosis.
Each end of the cell has an identical and complete set of 46 chromosomes or 23 pairs of homologous chromosomes at the end of anaphase; they are still diploid. In interphase, chromosomes replicate, and in anaphase, they separate. Thus, if the chromosome number in a diploid zygote is 40, the diploid organism has 40 chromosomes in total, which will be reduced to half during gamete formation via meiosis. As a result, a gamete will have 20 chromosomes. As a result, the correct answer is B. 20.
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