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The enzyme lactase breaks
lactose into glucose
glucose
lactose
nonfunctional lactase
functional lactase
Proteins in
the cells
lactose
lactose
Diagrams of the cells
What happens in the cells?
Phenotype
All of the lactase
proteins are
functional
(draw proteins here)
Half of the lactase
proteins are functional;
Half of the lactase
proteins are
nonfunctional
(draw proteins here)
All of the lactase
proteins are
nonfunctional
(draw proteins here)
The pigment enzyme changes a
colorless molecule to a red
pigment molecule
Proteins in
the cells
colorless
molecule
red pigment
functional pigment enzyme
Diagrams of the cells
All of the pigment
enzyme proteins
are functional
(draw proteins here)
Half of the pigment
enzyme proteins are
functional;
Half of the pigment
enzyme proteins are
nonfunctional
(draw proteins here)
All of the pigment
enzyme proteins are
nonfunctional
(draw proteins here)
colorless
molecule
colorless molecule
nonfunctional pigment enzyme
What happens in the cells?
Phenotype
The TSR receptor protein
sticks to bitter molecules
and signals bitter taste
Proteins in
the cells
functional
TSR receptor
bitter
molecule
Diagrams of the cells
All of the TSR
receptor proteins
are functional
The MAO enzyme changes
serotonin so it does not work
What happens in the cells?
(draw proteins here)
(draw proteins here)
other molecule
serotonin
fully functional MAO enzyme (fast)
Proteins in
the cells
Diagrams of the cells
All of the MAO
enzyme proteins
are fully
functional (fast)
(draw proteins here)
Half of the MAO enzyme
proteins are fully
functional (fast);
Half of the MAO enzyme
proteins are partially
functional (slow)
Phenotype
(draw proteins here)
Half of the TSR receptor
proteins are functional;
Half of the TSR receptor
proteins are
nonfunctional
All of the TSR
receptor proteins
are nonfunctional
nonfunctional
TSR receptor
bitter
molecule
(draw proteins here)
All of the MAO
enzyme proteins are
partially functional
(slow)
(draw proteins here)
other molecule
serotonin
partially functional MAO enzyme
(slow)
What happens in the cells?
Phenotype
Two alleles exist for the
lactase gene:
Genotypes
Allele codes for
functional lactase
Allele codes for
nonfunctional lactase
Diagrams of the cells
What proteins are in the cells?
Allele #1 = functional lactase
Allele #2 = functional
lactase
(draw proteins here)
Allele #1 = functional lactase
Allele #2 = nonfunctional
lactase
(draw proteins here)
Allele #1 = nonfunctional
lactase
Allele #2 = nonfunctional
lactase
(draw proteins here)
Two alleles exist for the pigment
enzyme gene:
Genotypes
Allele codes for
functional pigment
enzyme
Diagrams of the cells
Allele #1 = functional
pigment enzyme
Allele #2 = functional
pigment enzyme
Allele #1 = functional
pigment enzyme
Allele #2 = nonfunctional
pigment enzyme
(draw proteins here)
Allele #1 = nonfunctional
pigment enzyme
Allele #2 = nonfunctional
pigment enzyme
(draw proteins here)
Allele codes for
nonfunctional pigment
enzyme
What proteins are in the cells?
Two alleles exist for the TSR
taste receptor gene:
Genotypes
Allele codes for
functional TSR receptor
protein
Allele codes for
nonfunctional TSR
receptor protein
Diagrams of the cells
What proteins are in the cells?
Allele #1 = functional TSR
receptor protein
Allele #2 = functional
TSR receptor protein
(draw proteins here)
Allele #1 = functional TSR
receptor protein
Allele #2 = nonfunctional
TSR receptor protein
(draw proteins here)
Allele #1 = nonfunctional
TSR receptor protein
Allele #2 = nonfunctional
TSR receptor protein
Two alleles exist for the MAO
enzyme gene:
Genotypes
(draw proteins here)
Allele codes for fully
functional MAO enzyme
(fast)
Diagrams of the cells
Allele #1 = fully functional
MAO enzyme (fast)
Allele #2 = fully
functional MAO enzyme
(fast)
Allele #1 = fully functional
MAO enzyme (fast)
Allele #2 = partially
functional MAO enzyme
(slow)
(draw proteins here)
Allele #1 = partially
functional MAO enzyme
(slow)
Allele #2 = partially
functional MAO enzyme
(slow)
(draw proteins here)
Allele codes for partially
functional MAO enzyme
(slow)
What proteins are in the cells?
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