On what basis are the chromosomes usually classified?

Find the mismatched pair :

Out of the following combinations which individual will have maximum genetically active DNA?

Crossing over occurs at the time of ………

A mature woman has ………………. linkage groups.

The pairing of homologous chromosomes is called …………

If only one ‘X’ chromosome is found in a female person, which of the following symptoms will she show?

If centromere is situated in the middle of the chromosome, it is called ………

In which of the following disorders the number of chromosomes present is (extra) 47?

Down’s syndrome is represented by …………