Question

Chromosome complement with $2n-1$ is called as

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

Answer 1

The correct option is A Monosomy

Monosomy is absence of a single chromosome from a diploid cell (2n-1). Nullisomy is absence of one complete pair of homologous chromosomes (2n-2). Presence of one chromosome four times is called tetrasomy (2n+2). A diploid cell with an extra chromosome is trisomic (2n+1)

So, the correct answer is 'Monosomy'