Genetic Features - Figure 3. X Chromosome Abnormalities
During cell divisions in the process of gamete (egg or sperm) formation, an X or Y chromosome may undergo breakage or rearrangment.
- A chromosome consisting of two long arms, or q segments, is called an “isoXq” chromosome, and it is missing the short arm (p).
- Sometimes just a portion of the distal short(delXp) or long arm (delXq) is deleted.
- Sometimes breakage of the terminal ends of both long and short arms leads to joining together of the broken ends, forming a ring chromosome (rX).
