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A non-disjunction in the 1^st phase of meiosis will lead to ______________

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A non-disjunction in the 1^st phase of meiosis will lead to ______________

(a) Monosomy

(b) Nullysomy

(c) Disomy

(d) Trtrasomy

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I'd like to ask this question from Chromosomal Abnormalities : Aneuploidy topic in portion Chromosomal Basis of Inheritance of Cytogenetics

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The correct option is (b) Nullysomy

Best explanation: Nullysomy in chromosome is a loss of 2 chromosomes i.e. loss of a chromosomal pair. This can result from passing of both homologous chromosomes to the same pole during meiosis 1- this pole will produce trisomic gametes while the counterpart will produce nullisomic gametes.

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