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COLOR BLINDESS

By John Daniel “JD” Fogarty and Jude Kwaku Poku January 28 Period 3. COLOR BLINDESS. Color Blindness is defined as the inability to distinguish between certain colors.

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COLOR BLINDESS

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  1. By John Daniel “JD” Fogarty and Jude KwakuPoku January 28 Period 3 COLOR BLINDESS

  2. Color Blindness is defined as the inability to distinguish between certain colors. Color Blindness occurs when there is an absence of color-sensitive pigments in the cone cells of the retina, or the nerve layer at the back of the eye. Color Blindness symptoms can vary. Some people may have trouble seeing red, while others may have a difficulty with blue. These kinds of deficiencies are not so serious. For a person who has a full on color deficiency, the only colors they can see are different shades of black, white, and grey. Summary of Color blindness

  3. What numbers do you see? Color blindness tests

  4. Color blindness is X-linked recessive in the mother’s chromosome. It is more common in males than females. Color blindness chromosome

  5. People acquire the genetic disorder of color deficiency through birth. A color defective male always inherits the deficiency though his mother who usually has normal color vision, but is a carry of the defect. Mode of inheritence

  6. alleles

  7. Punnett squares are used to show the probability of receiving a genetic disorder from a parent. Punnett squares Dad G g G Mom g

  8. Ratios: 1: 2: 1 1 GG 2 Gg 1gg Percentages: 25%: 50% 25% 25% GG 50% Gg 25% gg Punnett square probability G g G g

  9. Uppercase letters represent dominant genes while lowercase represent recessive genes, which are always over powered by the dominant genes. A red gene represents a gene that is not a carrier of color blindness, while a green gene represents a gene that is a carrier. What are Punnett squares? G g G PHENOTYPES: WHAT YOU SEE GG=RED Gg=RED (Green Gene Carrier) gg= Green g GENOTYPES: WHAT IS IN THE GENES GG= Homozygous dominant (RED) Gg= Heterozygous dominant (RED with Green) gg= Homozygous recessive (Green)

  10. Phenotype: Ratio: 3 RED:1 Green Percentages: 75% RED:25% Green Genotype: Ratio: 1 GG:2 Gg:1 gg Percentages: 25% GG: 50% Gg: 25% gg Punnett Squares genotypes and phenotypes G g G g

  11. More Punnett squares! T t A A T A t a X y X x

  12. Practice time! y X Genotype: Ratio: 1XX:2Xy:1xy Percent: 25% XX:50%Xy:25%xy Phenotype: Ratio: 2 RED:2 Green Percent: 50% RED:50% Green X x Total Percentage for color blindness: 50%

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