If there is a non-disjunction in the X chromosome, the progeny being XXY, what will be the constitution of the chromosome(s) in the gamete?(a) X and Y(b) X and XY(c) XX and Y(d) XXY with no separationI had been asked this question in semester exam.Question is from Chromosomal Theory of Inheritance topic in division Chromosomal Basis of Inheritance of Cytogenetics

If there is a non-disjunction in the X chromosome, the progeny being X

1.	If there is a non-disjunction in the X chromosome, the progeny being XXY, what will be the constitution of the chromosome(s) in the gamete?(a) X and Y(b) X and XY(c) XX and Y(d) XXY with no separationI had been asked this question in semester exam.Question is from Chromosomal Theory of Inheritance topic in division Chromosomal Basis of Inheritance of Cytogenetics
Answer» Right choice is (b) X and XY Best explanation: The non-disjunction results in the PRODUCTION of XXY. Then these ALLELES separate as X and XY respectively. The male progeny in this CASE will be XYY and the females XXY but the XXX dies DUE to no gene compensation.

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