Principle of Inheritance and VariationMediumBloom L3
Question
The chromosome constitution 2n – 2 of an organism represents
Options
A.Monosomic
B.Nullisomic
C.Haploid
D.Trisomic
Solution
Sol.(b) [Key Concept: Aneuploidy — Nullisomic (2n-2)] 2n – 2 represents NULLISOMIC — an organism that has lost BOTH members of a particular homologous chromosome pair. Normal diploid = 2n; Monosomic = 2n-1 (one chromosome missing); Nullisomic = 2n-2 (both chromosomes of a pair missing); Trisomic = 2n+1 (one extra chromosome). Haploid = n (half the chromosomes). Nullisomics are usually inviable in animals but have been studied in plants like wheat.
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