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A turner child born to normal parents is haemophilic. Where did the non-disjunction occur?(a) Mother(b) Father(c) Zygote(d) Grand motherThe question was posed to me during a job interview.My doubt stems from Sex Linked Inheritance topic in portion Chromosomes and Sex Determination of Cytogenetics

Answer»

Correct option is (b) Father

For explanation I would say: The only POSSIBILITY here is that the MOTHER was a carrier. The EGG received this defective X chromosome from mother and no sex chromosome from the father. Thus, there was non disjunction in the father. The RESULTANT child was AA+ X’O. (X’=mutant).



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