Question

if there are 20 sister chromatids in a cell, how many chromosomes are there?

Answer 1

Answer:

That is, the normal number of chromosomes in the cell is 10, and there are normally 5 chromosome pairs. Now that there are 20 chromatids, they should be in identical pairs of two (sister chromatids) because replication has occurred. So, there would be 10 centromeres.

Answer 2

Chromosomes are thread like structure, which are present inside the nucleus. As one chromosome have 2 sister chromatids, so here 10 chromosomes are there.

What are sister chromatids?

These are identical copies of chromosomes formed by replication of DNA. Both sister chromatids are joined by a commom centromere. Typically a chromosome has two sister chromatids.

Thus, in case of 20 sister chromatids, 10 chromosomes will be there.

For more information about chromosome, visit:

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