HEREDITY

1
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.

2
PUNNET SQUARE
ADominant BRecessive
A
b
AA
Ab
A
b
Ab
bb
3
EARLOBES

• Dominant Recessive
• D_ dd

4
ROLLED TONGUE
Dominant Recessive D_
dd
5
WIDOWS PEAK
Dominant Recessive D_
dd
6
FRECKLES
Dominant Recessive D_
dd
7
EYE COLOR
Dominant Recessive D_
dd
8
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
9
BLOOD TYPE A,B,AB 0
A B Co-dominant O Recessive Type AAA or AO,
Type BBB or BO Type ABAB, Type OOO
10
BLOOD Rh FACTOR
Rh Positive is Dominant Rh Negative is Recessive
11
COLOR BLINDNESS
No Color Blindness is Dominant Color Blindness
is Recessive 1/12 Males, 1/250 Females
12
DWARFISM
AA Genotype is fatal (usually still born) Aa is a
Dwarf aa is Normal A is Dominant a is Recessive
13
HUNTINGTONS 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
14
ALBINISM
Not Having the Condition is Dominant Having the
Condition is Recessive
15
CLEF CHIN
Dominant Recessive D_
dd
16
CONNECTED EYEBROWS
Dominant Recessive D_
dd