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03 14 Class Activity Dominance

Genetics Notes on Dominance
Course

Intro To Genetics (BIOL 240)

4 Documents
Students shared 4 documents in this course
Academic year: 2023/2024
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Jordan Edwards
Western Carolina University
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TYPES OF DOMINANCE – Understanding Transmission and Molecular Genetics

A gene encodes pigment color. Assume that allele “A” is responsible for the trait of red color

and allele “a” is responsible for white color. Fill in the table to predict the phenotype

outcomes for individuals with specific genotypes depending on the dominance relationship

between A and a.

Type of

Dominance

(3 separate

scenarios)

Possible

genotypes

Predicted

phenotypes

for each

genotype

Predicted

phenotypes and ratio of

offspring

resulting from the

following

cross:

Aa X Aa

(cross between

heterozygotes)

Protein(s)

produced and

functionality

If A is

completely

dominant to a

(complete

dominance)

Example:

AA

Aa

aa

Example

AA – red

Aa

aa -

Red and white

offspring in 3:

ratio

A: protein “A” is produced,

100% functional. Protein

“a”

non-functional

a: protein a is produced,

100% non-functional

If A is

incompletely

dominant to a

(incomplete

dominance)

AA

Aa

aa

AA- red

Aa- pink

Aa- white

1:2:1 one red, two

pink, one white

Aa: protein A is produced

within a range between A

and a

A: protein “A” is produced,

100% functional. Protein

“a”

non-functional

a: protein a is produced,

100% non-functional

If A is

co-dominant

with A’ (white

color)

(co-dominance)

AA

Aa

aa

AA- red

Aa- red and white

Aa- white

1:2:1 one red, two

red and white, one

white

Aa: protein A is produced

fully with protein a

A: protein “A” is produced,

100% functional. Protein

“a”

non-functional

a: protein “a” is produced,

100% non-functional

TYPES OF DOMINANCE – Understanding Transmission and Molecular Genetics

Cremello (light cream), chestnut (brownish), or palomino (golden/light brown) are three

different horse coat colors. The following is observed when horses of a certain phenotype and

genotype are crossed with each other.

Cremello X

palomino

chestnut X palomino palomino X palomino Offspring:

½ cremello ½ chestmut ¼ chestnut ½ palomino ½ palomino ½ palomino ¼

cremello

Based on this information, the horse coat color appears to display incomplete dominance.

Explain the molecular phenotype for each color and how the molecular phenotype is affecting

the observed phenotype for each color.

Palomino is BB and it has the molecular phenotype similar to the observed phenotype.

Chestnut is Bb and it has a molecular phenotype different to the observed phenotype

because instead of having spots of both colors, it is within the range of the dominant and

recessive alleles

Cremello is bb and it has the molecular phenotype similar to the observed phenotype.

What phenotypes would be observed if this characteristic showed either of the other two

types of dominance?

Complete Dominance: For a cross between cremello and palomino, there would be either

100% cremello or 100% palomino

CoDominance: For a cross between cremello and palomino, there would be 100% of horses

that have spots of both colors.

Was this document helpful?

03 14 Class Activity Dominance

Course: Intro To Genetics (BIOL 240)

4 Documents
Students shared 4 documents in this course

University: Western Carolina University

Was this document helpful?
TYPES OF DOMINANCE – Understanding Transmission and Molecular Genetics
A gene encodes pigment color . Assume that allele “A ” is responsible for the trait of red color
and allele “a ” is responsible for white color. Fill in the table to predict the phenotype
outcomes for individuals with specific genotypes depending on the dominance relationship
between A and a.
Type of
Dominance
(3 separate
scenarios)
Possible
genotypes
Predicted
phenotypes
for each
genotype
Predicted
phenotypes and ratio of
offspring
resulting from the
following
cross:
Aa X Aa
(cross between
heterozygotes)
Protein(s)
produced and
functionality
If A is
completely
dominant to a
(complete
dominance)
Example:
AA
Aa
aa
Example
AA – red
Aa
aa -
Red and white
offspring in 3:1
ratio
A: protein “A” is produced,
100% functional. Protein
“a”
non-functional
a: protein a is produced,
100% non-functional
If A is
incompletely
dominant to a
(incomplete
dominance)
AA
Aa
aa
AA- red
Aa- pink
Aa- white
1:2:1 one red, two
pink, one white
Aa: protein A is produced
within a range between A
and a
A: protein “A” is produced,
100% functional. Protein
“a”
non-functional
a: protein a is produced,
100% non-functional
If A is
co-dominant
with A’ (white
color)
(co-dominance)
AA
Aa
aa
AA- red
Aa- red and white
Aa- white
1:2:1 one red, two
red and white, one
white
Aa: protein A is produced
fully with protein a
A: protein “A” is produced,
100% functional. Protein
“a”
non-functional
a: protein “a” is produced,
100% non-functional

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