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HEREDITY - PowerPoint PPT Presentation


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HEREDITY. Genotype: The genetic makeup of an organism. Phenotype: Observable genetic traits. Dominant: A genetic trait that is expressed with the presence of only one gene. Recessive: A genetic trait that is expressed only with the presence of both genes. . PUNNET SQUARE. A=Dominant

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heredity
HEREDITY
  • Genotype: The genetic makeup of an organism.
  • Phenotype: Observable genetic traits.
  • Dominant: A genetic trait that is expressed with the presence of only one gene.
  • Recessive: A genetic trait that is expressed only with the presence of both genes.
punnet square
PUNNET SQUARE

A=Dominant

B=Recessive

A

b

A

AA

Ab

b

Ab

bb

earlobes

EARLOBES

Dominant Recessive

D_ dd

rolled tongue
ROLLED TONGUE

Dominant Recessive

D_ dd

widow s peak
WIDOW’S PEAK

Dominant Recessive

D_ dd

freckles
FRECKLES

Dominant Recessive

D_ dd

eye color
EYE COLOR

Dominant Recessive

D_ dd

cystic fibrosis
CYSTIC FIBROSIS

Not Having the Condition is Dominant

Having the Condition is Recessive

1/2500 in Caucasians

SICKEL CELL DISEASE

Not Having the Condition is Dominant

Having the Condition is Recessive

1/400 in African Americans

blood type a b ab 0
BLOOD TYPE A,B,AB & 0

A B Co-dominant O Recessive

Type A=AA or AO, Type B=BB or BO

Type AB=AB, Type O=OO

blood rh factor
BLOOD Rh FACTOR

Rh Positive is Dominant

Rh Negative is Recessive

color blindness
COLOR BLINDNESS

No Color Blindness is Dominant

Color Blindness is Recessive

1/12 Males, 1/250 Females

dwarfism
DWARFISM

AA Genotype is fatal (usually still born)

Aa is a Dwarf

aa is Normal

A is Dominant

a is Recessive

huntington s disease
HUNTINGTON’S DISEASE

Having the Condition is Dominant

Not Having the Condition is Recessive

1/25,000 the Population

HEMOPHILA

Not Having the Condition is Dominant

Having the Condition is Recessive

albinism
ALBINISM

Not Having the Condition is Dominant

Having the Condition is Recessive

clef chin
CLEF CHIN

Dominant Recessive

D_ dd

connected eyebrows
CONNECTED EYEBROWS

Dominant Recessive

D_ dd