Thread: Everyday Science (My Notes)
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Old Saturday, November 26, 2011
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Chromosomes:


A chromosome is a rod-like portion of the chromatin of a cell nucleus, performing an important part in meiotic cell division, and in the transmission of heredity characteristics. Normally they are constant in number for any species; there are 22 pairs of chromosomes and two sex chromosomes in the human.

Types Of Chromosomes: in higher animals and plants, there are two fundamental types of chromosomes, which are classified on the basis of sex determination these are:
i) Autosomes
ii) Sex Chromosomes:

Autosomes:
These are paired somatic chromosomes that play no part in sex determination of organisms. These chromosomes are similar in males and females.

Sex Chromosomes:
The chromosomes that determine sex in organisms are called sex chromosomes. There are two types of sex chromosomes.
a) X- chromosome
b) Y- Chromosome
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