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Q.
Klinefelter’s syndrome results from
Principles of Inheritance and Variation
Solution:
Both options (a) and (c) are correct. This can be
explained as
In klinefelter’s syndrome, the sex chromosomes
genotype is $XXY$, i.e. there is one extra $X$-chromosome.
This extra $X$ can come in two conditions, when there is
non-disjunction in egg, i.e. $XX$ egg and $Y$ sperm and
where is non-disjunction in sperm, i.e. $X$ egg and $XY$
sperm.