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In XO system a male has a mother but not a _____________

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In XO system a male has a mother but not a _____________

(a) Grand father

(b) Father

(c) Grand mother

(d) Sibling

This question was addressed to me by my school principal while I was bunking the class.

I'd like to ask this question from Other Methods of Sex Determination topic in division Chromosomes and Sex Determination of Cytogenetics

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Right option is (b) Father

Easy explanation: The males are produced by parthenogenesis, i.e. by mitosis. While fertilization only takes place in case of a female child, only the two X chromosomes come together. Thus, the male has a mother but no father; they do however have a grandfather.

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