Question

When do you see sister chromatids (circle one)?

Before S-Phase                     After S-Phase             Before and After S-Phase

When sister chromatids attached to each other ?

When homologous chromosomes paired with each other?

Answer 1

Ans: After s phase.

Sister chromatid cohesion depends on cohesin, a tripartite complex that forms ring structures to hold sister chromatidstogether in mitosis and meiosis. Meiocytes feature a multiplicity of distinct cohesin proteins and complexes, some meiosis specific, which serve additional functions such as supporting synapsis of two pairs of sister chromatids and determining the loop–axis architecture of prophase I chromosomes.

Ans: during s phase sister choromatids attached to each other by centromere.

Ans: In metaphase I of meiosis I, the pairs of homologous chromosomes also known as bivalents or tetrads, line up in a random order along the metaphase plate. The random orientation is another way for cells to introduce genetic variation.