Question

14. A chemical which is able to prevent chromatid separation is added to a cell culture. Which phase of mitosis would be most affected? anaphase prophase telophase G1 G2

Answer 1

14) the cell cycle progress as G1, S, G2 and M phase, the DNA replicates during S phase so that each chromosome will have two sister chromatids attached to each other at the centromere.

M phase has 4 stages

Prophase, metaphase, anaphase and telophase, the DNA condense to form chromosomes, and during metaphase, the chromosomes align at the metaphase plate and the sister chromatids are separated during anaphase, an reach the poles during telophase.

so the phase of mitosis will be affected most due a chemical that separates the sister chromatids is prophase.

15)

the cell cycle progress as G1, S, G2 and M phase, the DNA replicates during S phase so that each chromosome will have two sister chromatids attached to each other at the centromere.

M phase has 4 stages

Prophase, metaphase, anaphase, and telophase,

so if there are X chromosomes in the cell there will be 2X sister chromatids during prophase so the answer is 2.

17) chiasma are the X shaped structures that are formed due to the crossing over between the non-sister chromatids, non-sister chromatids of the homologous chromosomes so the answer is no-sister chromatids exchange the DNA.