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Color Blindness
Occurs more frequently in men
sex-linked (X) affects light
receptors in the eye• red/green• complete
Muscular Dystrophy
Progressive muscle weakness/loss of muscle tissue
Sex - linked X chromosome usually begins in
early childhood
Cystic Fibrosis
Inherit 2 “CF” genes
autosomal disorder
mucus builds up in lungs
1/2500 people in U.S.
Turner Syndrome
A single X chromosome
1/5000 births sex organs do not
mature may be shorter than
average puffy hands/feet neck skin sterile
Klinefelter Syndrome
XXY 1/2000 births small testes sterile feminine body
characteristics taller than
average
Down Syndrome
Trisomy 21 broad, flat face upslanted eyes mental retardation 1/700 births in
U.S. The older you are
the greater your risk!
BALDNESS Sex-Influenced traits. More common in men
than women. Not exactly sure where
this trait resides? Men get it if
homozygous recessive bb or heterozygous Bb! Women only get it if they are homozygous recessive bb.
HUNTINGTON DISEASE
Dominant Trait. Shows up in the thirties
and forties, damage to nervous system begins.
Leads to mental retardation and loss of muscle control
Located on the 4th chromosome
SICKLE CELL ANEMIA
A disorder where the red blood cells are in the shape of a sickle.
Co-dominant disorder heterozygous=carriers Mostly found in people
with african heritage. Reason? Malaria, SCA
is partially resistant.
HEMOPHILIA
Sex-linked disorder Recessive allele bleeder’s disease Clotting factor is
missing. 1:10,000 males 1:100,000,000 females treatment-injecting
clotting factors
SPINA BIFIDA
When vertebrae in your spinal cord fail to develop and leaves a space causing damage to the nervous system
Cri Du Chat
1: 50,000 deletion on chromosome 5 abnormal larynx development cry of the cat Low birth weight Respiratory problems