Question

What is Cell Division?

2. How does a multicellular organism go from a single cell to a multicellular being?

3. What are Sister Chromatids, what is a Centromere, Chromatin, and a Genome?

Answer 1

Ans -1. Cell division as the name suggests is the division of a single cell into two or more daughter cells. It is of two types:

a. Mitotic or equational division

b.Meiosis or reductional division

Ans-2. A multicellular oragnism goes from a single cell to a multicellular being through mitotic division which forms daughter cells identical to parent cell.

Ans -3. At the time of DNA replication chromosome duplicates forming copies of itself called sister chromatids. The sister chromatids are attached to a point called centromere. Spindle fiber attaches to centromere only at the time of cell division. Chromatin is a condensed form of chromosome consisting of DNA and proteins only , that helps in the packaging of DNA. Genome is defined as the entire set of genetic information which are required for the normal functioning of an organism .