A to Z medical terms definitions (medical terminology dictionary )
|
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q | |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
Definition of q arm of a chromosome
q arm of a chromosome definition - medical term
The long arm of a
chromosome.
All human chromosomes have 2 arms -- a short arm and
a long arm -- that are separated from each other only by the centromere, the point at which the
chromosome is attached to the spindle during cell division.
By international convention, the short arm is termed the "p arm" while the long arm of the chromosome is termed the "q arm."
Examples of usage of p and q: Loss of part of 5p (the short arm of chromosome 5) results in the cat cry syndrome. Trisomy (an extra copy) of part of 21q (the long arm of chromosome 21) causes Down syndrome.
Origin of p and q as chromosome arms: The symbol "p" was chosen to designate the short arm because "p" stands for "petit", "small" in French. The letter "q" was selected to signify the long arm merely because "q" is the next letter in the alphabet.
medical
dictionary, online medical dictionary, medical terminology
dictionary, free online medical dictionary, medical
dictionary, online medical dictionary, medical terminology
dictionary, free online medical dictionary, dictionary
medical, dictionary medical online, dictionary medical
terminology, dictionary free medical online, dictionary free
medical, dictionary medical terms, dictionary drug medical
medicine, dictionary health illustrated medical nursing
profession stedmans, dictionary English medical, dictionary
medical online terminology, dictionary encyclopedia medical
online, condition dictionary medical, dictionary medical,
dictionary drug medical, medical dictionary software, cyclopedic
dictionary index medical tabers thumb,
medical dictionary, online medical dictionary, medical
terminology dictionary
