Question
Explain briefly the ‘rivet popper hypothesis’ of Paul Ehrlich.
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| S. No. | Syndrome | Cause | Characteristics of affected individuals | SexMale/ Female/ Both |
| 1. | Down’s | Trisomy of 21 | ‘a’- (i) (ii) | ‘b’ |
| 2. | ‘c’ | XXY | Overall masculinedevelopment. | ‘d’ |
| 3. | Turner’s | 45 with XO | ‘e’- (i) (ii) | ‘f’ |