Question

Chromosome complement $2n-1$ is

• A. Monosomy
• B. Nullisomy
• C. Trisomy
• D. Tetrasomy

Answer 1

The correct option is A Monosomy

1) Monosomy is the condition of having a diploid chromosome complement in which one chromosome lacks its homologous partner (2n-1)

2) Nullisomic is a genetic condition involving the lack of both the normal chromosomal pairs for a species (2n-2).

3) A trisomy is a chromosomal disorder characterised by an additional chromosome, so the person has 47 instead of 46.

4) A tetrasomy is a form of aneuploidy with the presence of four copies, instead of the normal two, of a particular chromosome.

So, the correct answer is 'Monosomy'.