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Question

Arm ratio in metacentric condition is
  1. 1:1
  2. 1:2
  3. 1:3
  4. 2:3

A
1:2
B
1:1
C
1:3
D
2:3
Solution
Verified by Toppr

The arm ratio in metacentric condition is 1:1. These are X-shaped chromosomes, with the centromere in the middle, so that, the two arms of the chromosomes are almost equal. A chromosome is metacentric, if its two arms are roughly equal in length. In a normal human karyotype, two chromosomes are considered metacentric: chromosomes 1 and 3. In some cases, a metacentric chromosome is formed by balanced translocation: the fusion of two acrocentric chromosomes to form one metacentric chromosome.

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