Question

Chromosome complement with $\text{2n-1}$ is called as:

• A. monosomy
• B. nullisomy
• C. trisomy
• D. tetrasomy

Answer 1

Answer: (A)

Aneuploidy is the deletion or addition of one or a few chromosome from the original genomes e.g., (i) Monosomy is ( $2n-2$ ) e.g.. Turner's syndrome. (ii) Nullisomy is ( $2n-2$ ). (iii) Trisomy is ( $2n+2$ ) e.g., Klinefelter's syndrome. (iv) Tetrasomy ( $2n+2$ ).