MCQ
In human female, barr bodies are formed by:
- AInactivation of mother's X chromosome
- BInactivation of father's X chromosome
- CInactivation of both mother's and father's X chromosomes
- DInactivation of either mother's or father's X chromosome
Explanation:
The inactivated X-chromosome in the somatic cell of the female is referred to as Barr body which is present as tightly coiled and visible heterochromatin.Dosage compensation in human is accomplished by the inactivation of one of the X chromosomes in females.It occurs in 200 celled embryo wherein each cell independently select either maternal or paternal X chromosome for inactivation.Once the selection is done, all lineages of that cell make the same selection during cell division and tissue differentiation. This random inactivation of maternal and paternal X chromosome makes a human female mosaic for X gene.
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| Column $- I$ | Column $- II$ |
| $(P)$ Biodiversity in India | $(1)\; 45,000$ |
| $(Q)$ Plant species in India | $(2)$ Insects |
| $(R)$ Most species rich group | $(3)$ Fungi |
| $(4) \;8.1\%$ |
$I.$ ethanol $II.$ bread $III.$ Incilage
Choose the correct option