Albinism a genetic disorder
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Albinism A Genetic Disorder. Gabby Badurek and Stef Amedrano Period 6/7. About Albinism. Albinism is a disorder that affects the skin, hair, and eyes. The hair, eyes, and skin usually have no pigment(color). Symptoms: No color in hair, skin, or iris of the eyes.

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Albinism A Genetic Disorder

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Albinism a genetic disorder

AlbinismA Genetic Disorder

Gabby Badurek and Stef Amedrano

Period 6/7


About albinism

About Albinism

  • Albinism is a disorder that affects the skin, hair, and eyes.

  • The hair, eyes, and skin usually have no pigment(color).

  • Symptoms:

    • No color in hair, skin, or iris of the eyes.

    • Lighter hair color and skin.

    • Patch, or missing skin color.

  • Interesting Facts:

    • Sometimes the eye color can change

    • People with albinism are sensitive to light (photophobic)

    • Other forms of Albinism are involved with symptoms of other disease


Albinism s chromosome

Albinism’s Chromosome

OCA1 is located in Chromosome 11.

Chromosome 11

Location of OCA1 on Chromosome 11


Mode of inheritance

Mode Of Inheritance

Albinism is Autosomal Recessive

Autosomal Recessive- Two copies of the abnormal gene must be present in order for the disease or trait to develop.


Alleles

Alleles

  • Allele- Alternative forms of a gene for each variation of a trait of an organism.

  • One from mother, One from Father.

  • Recessive- aa

    -Trait that can be masked by the dominant form of a trait.

  • Dominant- AA

    • Observed trait that masks the recessive form of a trait.

  • Carrier- Aa

    • Trait that has both a good gene and bad gene, but doesn’t have the bad gene effect.


Punnett squares

Punnett Squares

a

a

a

A

A

A

a

A


Punnett squares and ratios

Punnett Squares and Ratios

a

A

  • Ratios-

  • 1 2 1

  • AA | Aa | aa

A

a

Percentages-

25% 50% 25%

AA | Aa | aa


Punnett squares1

Punnett Squares

A

a

A = Dominant Allele

a = Recessive Allele

A

Genotype: In Gene

AA = Homozygous

Dominant(not albino)

Aa = Heterozygous dominant(not albino)

aa = Homozygous recessive(albino)

a

Phenotype:

AA= Not albino

Aa = Not Albino but Gene Carrier

aa= No Melanin/Albino


Punnett squares2

Punnett Squares

A

a

Phenotype- Physical (Seen)

Ratios:

1 Albino ; 3 Not Albino

Percentages:

25% Albino ; 75% Not Albino

A

a

Genotype- Genes (Genetic)

Ratios:

1AA : 2Aa : 1aa

Percentages:

25%AA: 50%Aa: 25%aa


Student practice

Student Practice!

A

a

Genotype:

Ratio:

1 : 1 : 2

AA : Aa : aa

Percentage:

25% : 25% : 50%

AA : Aa : aa

Phenotype:

Ratio:

2 NO Albinism; 2 Albinism

Percentage:

50% No Albinism; 50% Albinism

a

a


Pedigree

Pedigree

Gabby

Tyler

Ventura

Jessica

Kevin

Steph

Yvenson

Stef

Emma

Jeff

Purple- Fine. NO ALBINISM!

Pink- Not fine. ALBINISM PRESENT!

Rectangle- Male Oval- Female


Student practice1

Student Practice

Key

Circle: Female

Square: Male

Pink: Albinism

Purple: Non-Albinism

Gabby

Tyler

Jessica

Kevin

Ventura

Steph

Yvenson

Stef

Emma

Jeff

Questions:

What will happen to the child if both of the parents have recessive genes?

What would 2 results be if Emma(aa) and a male carrier(Aa) had children?

Would the child have a possibility of albinism or not?


Albinism a genetic disorder

THE END 


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