Q. A turner child born to normal parents is haemophilic. Where did the non-disjunction occur?

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Q. Both Drosophila and mammals have XY system of sex determination. Dosage compensation y inactivation of one X chromosome is seen in ___________________

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Q. Barr bodies are found ________________

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Q. The X inactivation in female occurs by the process of lyonisation.

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Q. If a chromosome loses its XIC due to deletion it will_______________________

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Q. Due to the translocation process, the XIC from one X chromosome in a woman passed to chromosome 3. The individual died. What were the probable reasons of death?

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Q. Lysonization takes place ____________

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Q. _____________________ determines which X chromosome remains active.

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Q. Which one of the following is the only active gene in the inactivated X chromosome?

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Q. X inactivation is an example of epigenetic phenomenon.

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Q. XIST mRNA coats the inactive X and calls in _____________

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Q. Tortoise shell or calico cats are always ________________ for O locus that is responsible for orange color development.

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Q. Calico cats are always______________

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Q. The XXY klinefelter survive but trisomy in most autosome is lethal. Why?

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Q. Which one of the following is true for Drosophila?

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Q. The sex influenced traits are present in _______________________

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Q. Sex influenced traits are only related to females.

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Q. If A is a sex influenced trait that is more expressed in males, then which of the following is false?

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Q. If present of horn in a breed of sheep is due to the presence of h⁺ allele which is sex influenced and more expressed in male, choose the off one out.

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Q. Patterned baldness is a sex influenced trait more expressed in a male. If b+ is normal allele making non-bald phenotype and b is mutant leading to bald phenotype, for a cross between a bald mother and normal father, what is the probability of a bald son?

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