Define structural chromosomal aberration.

Given below are the gene sequence on the chromosome. Compare them with the normal chromosome and identify the type of structural chromosomal aberrations. Normal Chromosome : A - B - C - D - E - F - G - H - I. chromosome - 1 - A- B - C - B - C - D - E - F - G - H - I. Chromosome 2 : A - B - C - D - F - G - H - I

How is structural chromosomal aberration classified?

What causes structural chromosomal aberration occur?

Chromosomal aberrations refer to

The other name for numerical chromosomal aberration _____

In Drosophila melanogaster, there are four pairs of chromosomes. If there occurs chromosomal aberrations resulting in trisomic and monosomic condition , what will be the chromosomal count ? Write correct chromosomal count against respective chromosomal aberration.

Which pair is a chromosomal aberration?

Explain how translocation chromosomal aberration is different from crossing over?

Assertion (A): Amniocentesis helps to diagnose the chromosomal aberrations in foetus. Reason (R): Amniocentesis is legalized is our country.

(i) What are allosomes? (ii) Explain the structure of a chromosome.