NEET Biology question
Due to non-disjunction of chromosomes during spermatogenesis, some sperms carry both sex chromosomes (22A + XY) and some sperms carry no sex chromosome (22A + O). If these sperms fertilize normal eggs (22A + X), what types of genetic disorders appear accordingly among the offspring?
Answer: (A)
Solution
Fertilizing a normal egg (22A + X) with the abnormal 22A+XY sperm gives a zygote with 44A + XXY — Klinefelter's syndrome. Fertilizing the same normal egg with the abnormal 22A+O (no sex chromosome) sperm gives a zygote with 44A + X0 — Turner's syndrome.
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