If we start with one homologous chromosome with two sister chromatids, and then the chromatids get pulled apart so that each daughter cell gets only one, then why are those daughter cells considered diploid? It seems to me that if they have only one copy of each chromosome they are haploid until S phase when DNA is replicated. But my textbook and everything I look up says that mitosis produces diploid cells.
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Don’t confuse sister chromatids with mom and dad pairs. Sister chromatids are two identical dna strands. So when the DNA replicates the cell ends up with 2 sets of the maternal and 2 sets of the paternal chromosome. So for a brief moment they are tetraploid. The chromatids split giving one chromosome from each parent.
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