Is the diploid number talk about the # of chromosomes b4 or after they duplicate?

Answer 1

Human cells have 46 chromosomes each. This is the diploid number because diploid means "having two of each kind of chromosome".

In mitosis or meiosis, the diploid number is the same before and after chromosomes duplicate during prophase. We have 46 chromosomes, 2 of each kind BEFORE the DNA is copied. After the DNA is copied, we still have 46 chromosomes, 2 of each kind. It's just that each chromosome is now double-stranded with two sister chromatids. The diploid number is still 46 AFTER duplication.

The haploid number comes into play during meiosis I when the homologous chromosomes are separated from each other. They're still double stranded with two sister chromatids each, but putting one homolog from each pair into each new cell makes the results of meiosis I haploid.

Answer 2

after