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Eye Trick
 

Eye Trick

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    Eye Trick Eye Trick Presentation Transcript

    • What number do you see?
    • 2.
      • Normal will see “45”
      • Colorblind will see nothing but spots.
    • 3.
      • Normal will see “56”
      • Colorblind will see “56”
    • 4.
      • Normal will see “6”
      • Colorblind will see nothing but spots.
    • 5.
      • Normal will see “8”
      • Colorblind will see nothing but spots .
    • 6.
      • Normal will see “5”
      • Colorblind will see “2”
    • 7.
      • Normal will see a circle, star and a square
      • Colorblind will see a circle, star and a square.
    • 8.
      • Colorblind will see only a yellow square.
      • Normal vision will see both a yellow square and a ‘faint’ brown circle.
    • 9.
      • Colorblind will see a yellow circle.
      • Normal will see a yellow circle and a “faint” brown square.
    • 10.
      • Normal will see a “faint” brown boat.
      • Colorblind will see nothing. (only spots)
    • 11.
      • Normal will see “2”
      • Colorblind will see nothing but spots.
    • 12.
      • Normal will see “5”
      • Colorblind will see nothing but spots.
    • 13.
      • Normal will see “15”
      • Colorblind will see either a “13” or “17” or nothing but spots.
    • 14.
      • Normal will see nothing but spots.
      • Colorblind will see “5”
    • 15. Can you see a line?
    • 16. Can you see a line?
    • 17.
      • Normal will see “73”
      • Colorblind will see nothing but spots.
    • 18.
      • Normal will see “7”
      • Colorblind will see nothing but spots.
    • 19.
      • Normal will see “16”
      • Colorblind will see nothing but spots.
    • 1910 – Thomas Hunt Morgan
      • He performed genetic experiments on fruit flies – Why fruit flies?
      • Prolific breeders.
      • New generation every two weeks.
      • Only four pairs of chromosomes.
    •  
    • What did Morgan do?
      • Morgan took a fruit fly with red eyes and mated it to a fly with white eyes.
      • All the F 1 had red eyes. (red – dominant)
      • His F 2 ratio? He got what he expected…
      • 3 red : 1 white
      • HOWEVER , all the flies with white eyes were male. He found no female flies with white eyes.
    • What did Morgan conclude?
      • A fly’s eye color is linked to its gender.
      • The gene for eye color had to be located on the chromosome that determined gender – the X chromosome.
      • That is why this type of inheritance is referred to as X-linked inheritance . (Sometimes its called a sex-linked trait.)
      • XX – female; XY – male
      • What are some other common x-linked conditions?
    • Androgenetic alopecia Male pattern baldness is a sex-linked characteristic that is passed from mother to child. A man can more accurately predict his chances of developing male pattern baldness by observing his mother's father than by looking at his own father.
    • Hemophilia
    • Duchenne Muscular Dystrophy
    • How do you use a Punnett Square to solve an X-linked problem?
      • Since the trait is linked to gender, you must include a X and Y for the father and a X (and possibly a second X) for the mother.
      • Alleles must be written with the X chromosome only – not the Y
      • (e.g. X A X A or X A Y or X a Y or X A X a )
      •  Try this sample question…
      • A colorblind man marries a woman with normal vision. They have two daughters and one son. The son is color-blind. One daughter is color-blind and the other has normal vision.
      • a. Draw a pedigree representing this family. Shade in those symbols representing color-blind individuals. Symbols representing people with normal vision should be left blank. Carriers should be partially colored in or given a dot.
      • b. What is the genotype of the father?
      • c. What is the genotype of the mother?
      • d. What are the genotypes of the children?