...are present in a cat's ? sperm cells?
(b) How many sister chromatids are present in a cell that is entering the first meiotic division? (c) In a cell that is entering the second meiotic division?

Facts and concepts:
1. Chromosomes come in pairs - that is, there are two homologous chromosomes in each pair.
2. Chromosome duplication creates two sister chromatids for each chromosome in the cell.
3. The first meiotic division reduces the number of duplicated chromosomes (and the number of sister chromatids present) by a factor of two.
4. The second meiotic division reduces the number of sister chromatids by another factor of two.