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There are 10 centromeres if there are 20 chromatids in a cell in G1 phase.

What is a chromosome?

A chromosome is a short DNA molecule that includes the entirety or a portion of an organism's genetic code. Packaging proteins can be found on the majority of eukaryotic organisms.

It is given that:

Number of chromatids = 20

There are 20 chromatids, replication has taken place, thus they should be in identical pairs of two (sister chromatids). Ten centromeres would therefore exist.

Thus, there are 10 centromeres if there are 20 chromatids in a cell in G1 phase.

Learn more about the chromosome here:

https://brainly.com/question/1596925

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