Due to non-disjunction of chromosomes during spermatogenesis, some sperms carry both sex chromosomes (22A+XY) and some sperms do not carry any sex chromosome (22A+0). If these sperms fertilise normal eggs (22A+X) which type of genetic disorders appear among off springs?
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a
Down’s syndrome and Edward syndrome
b
Klinefelter’s syndrome and Turner’s syndrome
c
Down’s syndrome and Turner’s syndrome
d
Klinefelter’s syndrome and Down’s syndrome
answer is B.
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Detailed Solution
If sperm of with no sex chromosomes fertilises an ovum with X chromosome, it results in zygote with XO (Turner's syndrome).If sperm with XY chromosomes fertilises an ovum with X chromosomes, it results in zygote with XXY (Klinefelter's Syndrome).Edward Syndrome - Trisomy 18Down's Syndrome - Trisomy 21