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a
Female heterogamety - Humans
b
2n + 1 of sex chromosome – Turner’s Syndrome
c
2n + 1 chromosomes - Trisomy
d
Male heterogamety - Birds
answer is C.
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Detailed Solution
Trisomy condition (addition of an extra copy of chromosome) : 2n+1Turner's Syndrome is loss of a sec chromosome (XO) : 2n -1Female heterogamety : BirdsMale heterogamety : Humans