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What is the probability of having a girl child in sixth pregnancy if the first five progenies are boys?(a) 25%(b) 50%(c) 65%(d) 10%I had been asked this question in an interview for job.My doubt stems from Inheritance and Variation Principles topic in section Principles of Inheritance and Variation of Biology – Class 12

Answer»

Right answer is (b) 50%

The best EXPLANATION: The probability of having a GIRL child in the sixth pregnancy, where the first five progenies were MALE is 50%. As humans SHOW XY type of male heterogamety, where 50% sperms carry 22+ X chromosomes and the other 50% carry 22+Y chromosomes, therefore in each pregnancy there is 50% probability of either a male or a female child.



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