t g a c t t t c c c c g g a a a a a c t g a a a g g g g c c t t t t
TRANSCRIPT
T
G
A
C
T
T
T
C
C
C
C
G
G
A
A
A
A
A
C
T
G
A
A
A
G
G
G
G
C
C
T
T
T
T
To help remember the base pairings,
think of the phone
company, AT&T
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22X Y
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22X Y
Gene for Eye ColorGene for Hair Color
piece of DNA
piece of DNA
pair of chromosomes
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22X Y
Gene for Eye ColorGene for
Eye Color
Mother’s Gene for Eye Color
Father’s Gene for Eye Color
Allele for brown eyes Allele for blue eyes
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22X Y
Brown Brown Brown
Eye Color
blue Brown blue
Brown Eye Color?
Blue Eye Color?
Phenotype [Mendelian Inheritance]
The Dominant allele is the Capital Letter (“B”)
The Recessive allele is the Lowercase Letter (“b”)
B b Brown Eye Color Phenotype
B B Brown Eye Color Phenotype
B b Brown Eye Color Phenotype
B B Brown Eye Color Phenotype
Phenotype is Brown Eye Color
B b
Brown Eye Color isthe Dominant Allele
Phenotype is Brown Eye Color
B B
Brown Eye Color isthe Dominant Allele
b b Blue Eye Color Phenotype
Phenotype is Blue Eye Color
b b
Two Recessive AllelesFor Blue Eye Color
