Question

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

• A. Down's syndrome
• B. Klinefelter's syndrome
• C. Turner's syndrome
• D. Gynandromorph

Answer 1

Answer: (C)

Syndrome	Genotype	Characters
Down's syndrome	Trisomy of $21st$ chromosomes $45+XX$ or $45+XY$	Mental retardation, short neck
Kinefelter's syndrome	$44+XXY$	Sterile male with small penis
Turner's syndrome	$44+XO$	Neck short and webbed
Gynandromorph		Half male and half female body

So, a person having $45$ chromosomes i.e., $Y$ chromosomes absent is suffering from-Turner's svndrome $(44+X0)$