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science project

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shakor presley

on 28 April 2010

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Transcript of science project

Shakor Presley Color Blindness Science Project Part One:
Autosomal recessive disorder- two copies of an abnormal gene must be present in order for the disease or trait to develop.
Autosomal dominant disorder- a disease caused by a dominant mutant gene on an autosome.
Sex- linked disorder- genetic disorders caused by mutations in genes on the sex chromosomes (X and Y) Nondisjunction- failure of paired chromosomes to disjoin during cell division so that both chromosomes go to one daughter cell and none to the other. Also causes errors in chromosome number such as trisomy 21 (Down's syndrome) and monosomy X (Turner syndrome).

Chromosomal deletion- a deletion occurs when a chromosome breaks and some genetic material is lost.

Part Two: Causes of Color Blindness include the following:
Eye problems, such as glaucoma, macular degeneration, cataracts, or diabetic retinopathy.
Injury to the eye.
Side effects of some medicines.
Symptoms of Color Blindness may include the following:
Trouble seeing colors and the brightness of colors in the usual way.

Inability to tell the difference between shades of the same or similar colors.

Often, the symptoms may be so mild that some people do not know they are color blind. A parent may notice signs of color blindness when a child is learning his or her colors.
Rapid, side-to-side eye movements and other symptoms may occur in severe cases.
Autosomal- a chromosome that is not a sex chromosome; relating to any one of the chromosomes save the sex chromosomes.
Color blindness is a sex-linked x recessive disorder Researchers studying red/green color blindness in the United Kingdom reported an average prevalence of only 4.7 percent in one group. Only 1 percent of Eskimo males are color blind. Approximately 2.9 percent of boys from Saudi Arabia and 3.7 percent from India were found to have deficient color vision. Red/green color blindness may slightly increase an affected person's chances of contracting leprosy. Pre-term infants exhibit an increased prevalence of blue color blindness. Achromatopsia has a prevalence of about one in 33,000 in the United States and affects males and females equally.

Color vision test can be the only way for you know if you are color blind for sure. Ishihara plates are the best known color blindness tests, but they are not the most accurate ones. Punnet Square Color blindness is more prevalent among males than females, because the most common form of color vision deficiency is encoded on the X sex chromosome.

About 8% of all men are suffering from color blindness.

Sex-linked disorders such as color blindness may involve a deviation in the number of either the X or Y chromosomes, as occurs in Turner's syndrome and Klinefelter's syndrome, most occurrences of which are a result of nondisjunction during meiosis. Attributions: Color blindness test pictures: Xc XC Xc Y XCXc XCY XcXc XcY 1.---. “Color Blindness.” http://www.toledo-bend.com/colorblind/aboutcb.asp.hmtl , 4/20/10
2.---. “Color Blindness.” http://colorvisiontesting.com./hmtl , 4/20/10
3.---. “Color Blindness test.” http://www.colblindor.com/2009/01/06/50-facts-about-color-blindness/.html , 4/20/10
4.---. “Color Blindness .” http://www.buzzle.com/articles/color-blindness-facts.html , 4/21/10
5.---. “Symptoms of Color Blindness.” http://www.wisegeek.com/what-are-the-symptoms-of-color-blindness.html , 4/21/10
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