Archive
7th of September 2015
Biology
Q:

sir i didnot get cell division chapter so can u explain me ?

Shruti Thakur - CBSE - Class XI Science

Monday, September 07, 2015 at 18:07:PM

A:

Hi Shruti,

Cell division is an essential feature in all living organisms.

  • Amitosis - Amitosis is a method of asexual reproduction which occurs in acellular organisms such as bacteria, protozoa, old cells, mammalian cartilage cells and in foetal membranes.
  • Mitosis - Mitosis is the division of the parent cell into two identical daughter cells, each with a nucleus which has the same amount of DNA, same number and type of chromosomes and same hereditary information as in the parent cell. Hence, mitosis is regarded as equational division.

               Events in Mitosis:

  • Meiosis - Sexually reproducing organisms undergo meiosis, and some special cells in multicellular organisms undergo meiosis instead of mitosis at a specific time in the life cycle.
  • Meiosis produces gametes in animals, some lower plants and various protists and fungi. It forms asexual reproductive bodies called spores in higher plants which give rise to gamete-producing structures which produce gametes by mitosis.

               Events in Meiosis:

For detailed information please register yourself or log on to www.topperlearning.com

Monday, September 07, 2015 at 18:22:PM