When are chromosomes copied?

In human males all the chromosomes are paired perfectly except one. The unpaired chromosomes are:

What are chromosomes made up of?

When closely placed genes on the same chromosome are inherited together the phenomenon is called

The end of a chromosome is called_______

What is Holocentric chromosomes ?

Polytene chromosomes are formed by ………..

Identify the correct statements from the below about "Features of the chromosomes". (I) The shape of the chromosome is specific. (II) The number of choromosomes per species is fixed. (III) Chromosomes occur rence in pairs. (IV) Chromosomes are not copied.

Three copies of chromosome-21 in a child with Down's syndrome have been analysed using molecular biology technology to detect any possible DNA polymorphism with reference to different alleles located onchromosome-2 1. Results showed that out of 3 copies 2 of the chromosomes of the child contain the same alleles ,as one of the mother's alleles. Based on this when did the non-disjunction event most likely occur?

Assertion : The acrocentric chromosome has centromere at the terminal position. Reason : The metacentric chromosome has centromere slightly away from the middle of the chromosome.