what is centromere? how does the position of the centromere from the basis of classification of chromosomes .support your answer with a diagram showing the position of centromere on different types of chromosomes ?
Answers
Centromere is a specialised DNA sequence which binds or hold two sister chromatids together in a chromosome
on the basis of position of centromere there are 4 types of chromosomes-
1)Metacentric - centromere located in the centre
2)Submetacentric- centromere are located just above the centre
3)Acrocentric-centromere is located near the terminal
4)telocentric-centromere at the terminal
sorry I dont have diagrams!
you may understand by this-
if you pull a metacentric chromosome through its centromere you will get a V shaped structure similarly a submetacentric -L shaped a acrocentric -J shaped while telocentric will be i shaped
hope this may help you.
hlo....yl
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Centromere is a constriction present on the chromosomes where the chromatids are held together.
Chromosomes are divided into four types based on the position of the centromere.
(i) Metacentric chromosome
The chromosomes in which the centromere is present in the middle and divides the chromosome into two equal arms is known as a metacentric chromosome. During anaphase, they appear V-Shaped.
(ii) Sub-metacentric chromosome
The chromosome in which the centromere is slightly away from the middle region is known as a sub-metacentric chromosome. In this, one arm is slightly longer than the other. During anaphase, they appear L-Shaped.
(iii) Acrocentric chromosome
The chromosome in which the centromere is located close to one of the terminal ends is known as an acrocentric chromosome. In this, one arm is extremely long and the other is extremely short. During anaphase, they appear J-Shaped.
(iv) Telocentric chromosome
The chromosome in which the centromere is located at one of the terminal ends is known as a telocentric chromosome. During anaphase, they appear i-Shaped.
@amansaini76✅