Submitted by: Submitted by schelma
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Category: Science and Technology
Date Submitted: 10/13/2010 03:31 AM
Polydactylism-autosomal dominant trait
Early theories for polydactyly concerned disorders in the programmed cell death cycle of fetal limb development
Current theories focus on mutations in specific genetic locations that cause limb development to go awry
Preaxial polydactyly-the most common type, refers to the duplication of the first digit
Central polydactyly-involves duplication of the second, third, or fourth digit
Postaxial polydactyly- involves the duplication of the fifth digit
Syndactylism-fusion of the claws or digits ,autosomal recessive manner
occurs when apoptosis or programmed cell death during gestation is absent or incomplete
Thyroglossal duct cyst-a fibrous cyst that forms from a persistent thyroglossal duct.
A thyroglossal duct that fails to atrophy is called a persistent thyroglossal duct
The thyroid gland forms during embryonic development, it begins at the base of the tongue and moves down the neck through a canal called the thyroglossal duct. Sometimes, portions of the duct remain leaving cavities or pockets called cysts. These cysts can fill with fluid or mucus, and may enlarge if they become infected.
GLAUCOMA-a disease of the major nerve of vision, the sneak thief of sight
Cataract-clear aspirin-sized lens of the eye starts to become cloudy
Progeria-symptoms resembling aspects of aging are manifested at an early age.
a childhood disorder caused by a point mutation in position 1824 of the LMNA gene, replacing cytosine with thymine, creating an unusable form of the Lamin A is part of the building blocks of the nuclear envelope Unlike most other "accelerated aging diseases” progeria is not caused by defective DNA repair. Because these diseases display different aspects of aging but never every aspect, they are often called "segmental progerias”.
COLOR BLINDNESS-perceive differences between some of the colors that others can distinguish.
MONOCHROMACY-total color blindness
DICHROMACY-which...