Question

Chromosome complement with $2n-1$ is called

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

Answer 1

Answer: (A)

When a change in the chromosome number does not involve entire sets of chromosome and restrict to only a few of chromosome, the situation is called aneuploidy. Aneuploidy may be of following types
(a) Monosomic $(2n-1)$
(b) Trisomic $(2n+1)$
(c) Nullisomic $(2n-2)$
(d) Tetrasomic $(2n+2)$
(e) Double momosomic $(2n-1-1)$
(f) Double trisomic $(2n+1+1)$