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  4. A person having 45 chromosomes and Y chromosome absent, is suffering from :

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Q. A person having $45$ chromosomes and $Y$ chromosome absent, is suffering from :

Haryana PMTHaryana PMT 2005

Solution:

A person having $45$ chromosomes instead of $46$ due to lack of $Y$ chromosome are suffering from Turners syndrome. They are $XO$ individual, usually formed by an $X$ carrying sperm, fertilising an $O$ egg. Such indiviuals are undeveloped females. They may not menstruate.