Here is a brief detail about abnormalities abstracted from different books and notes:
Main types of Abnormalities are given below:
A) Chromosomal Abnormalities
1. Down Syndrome
2. X-Linked abnormalities:
i) Klinefelter syndrome
ii) Fragile X-Syndrome
iii) XYY Syndrome
vi) Turner Syndrome

B). Gene-Linked Abnormalities
i) Phenylketonuria
ii) Sickle Cell Anemia.
Effects of these abnormalities in personality development on different stages.

I have notes of a csp but in hard copy, I think it will give you a clear understanding about your confusion regarding abnormality topic.
Regards