Structure of Chromosome

Structure of Chromosome
Chromosomes can only be seen when the cells are divide. A chromosome is made up of
1. Chromatid
2. Centiomere
1. Chromatids
Each chromosome consists of two very fine thread like structure called Chromatids.
Chromonema
Each chromatids of a chromosomes consists of one or more fine thread called Chromonema.
Chromomere
Chromonema contain deeper staining regions along their length, giving the threads like appearance of strings of beads. These regions are called Chromomeres.
Types of Chromotids
There are two types of chromatids.
i. Sister Chromatids
2. Non-Sister Chromatids
i. Sister Chromatids
The two chromatids of same chromosome are called Sister Chromatids.
ii. Non-Sister Chromatids
The chromatids of different chromosomes are called Non-Sister Chromatids.
2. Centromere
The region or point in which the chromatids are linker together is called Centromere.
Kinetochore
Centeomere is small spherical zone on the chromosome, within centromere a disc shape protein structure called Kinetochore is present to which the spindle fibres attached during cell division.