NEET Biology question
Consider the following statements regarding chromosomal aberrations and select the incorrect one(s). I. Chromosomal aberrations refer to changes in the number and arrangement of genes in the chromosomes. II. Aneuploidy refers to the condition where the genome comprises extra or fewer chromosomes than its normal number in a species. III. Heteroploidy occurs due to non-disjunction of chromosomes of a homologous pair. IV. Nullisomy is a type of hyperploidy in which one chromosome is devoid of its homologue.
Solution
Nullisomy refers to the loss of both members of a homologous chromosome pair (), representing a *deficiency* (loss) of chromosomes — this makes it a type of hypoploidy (fewer chromosomes than normal), not hyperploidy (which refers to an excess of chromosomes, such
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