Q. A person having $45$ chromosomes and Y-chromosome absent, is suffering from :
BHUBHU 2003
Solution:
Syndrome
Genotype
Characters
Down's syndrome
Trisomy of $21 st$ chromosomes $45+X X $ or $45+X Y$
Mental retardation, short neck
Kinefelter's syndrome
$44+X X Y$
Sterile male with small penis
Turner's syndrome
$44+X O$
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 $(44+X 0)$
| Syndrome | Genotype | Characters |
|---|---|---|
| Down's syndrome | Trisomy of $21 st$ chromosomes $45+X X $ or $45+X Y$ | Mental retardation, short neck |
| Kinefelter's syndrome | $44+X X Y$ | Sterile male with small penis |
| Turner's syndrome | $44+X O$ | Neck short and webbed |
| Gynandromorph | Half male and half female body |