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7. Genetics, Populations, Evolution, and Ecosystems
7.1 Inheritance
7.1.3 Codominance and Multiple Alleles
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Match the inheritance pattern with an example:
Codominance ↔️ Blood type AB
Complete dominance ↔️ Brown eyes vs blue eyes
What is the phenotype of roan cattle in codominance?
Speckled red and white
In codominance, the phenotype of a heterozygote is a combination of traits from both
alleles
Codominance occurs when two different alleles of a gene are both fully expressed in the
phenotype
How do heterozygotes in codominance differ from homozygotes?
Display distinct traits
What feather color do BW heterozygotes exhibit in Andalusian chickens?
Blue-gray
Match the genetic inheritance pattern with its example:
Multiple Alleles ↔️ Human Blood Types (A, B, O)
Codominance ↔️ AB Blood Type
What is the definition of codominance in genetics?
Both alleles are fully expressed
How do heterozygotes differ in codominance compared to complete dominance?
Distinct traits from homozygotes
Blue-gray feathers in Andalusian chickens are an example of
codominance
.
True
In human blood types, which antigen is expressed in codominance for type AB blood?
Both A and B
In codominance, what happens to allele expression?
Both alleles are fully expressed
In humans, blood type AB is an example of
codominance
Multiple alleles refer to the presence of more than two alleles for a particular
gene
In human blood types, which allele is recessive?
O
Arrange the alleles of the C gene in rabbits according to their dominance hierarchy:
1️⃣ C (full color)
2️⃣ c^h (Himalayan)
3️⃣ c^e (chinchilla)
4️⃣ c (albino)
In codominance, there are only two alleles for a gene, while in multiple alleles, there are more than two in the
population
An example of codominance is blood type AB, while an example of complete dominance is brown versus blue
eyes
AB blood type in humans is an example of
codominance
.
True
Match the examples of codominance with their descriptions:
AB blood type ↔️ Expresses both A and B antigens
Roan cattle ↔️ Mix of red and white hairs
Andalusian chickens ↔️ Blue-gray feathers from black and white alleles
Arrange the rabbit coat color alleles from most dominant to least dominant:
1️⃣ C (full color)
2️⃣ c^h (Himalayan)
3️⃣ c^e (chinchilla)
4️⃣ c (albino)
Match the inheritance patterns with their examples:
Codominance ↔️ AB blood type
Multiple alleles ↔️ ABO blood group in humans
In codominance, heterozygotes display traits intermediate between the two
alleles
.
True
Individuals with blood type AB express both A and B
antigens
What is the key difference between codominance and complete dominance?
Allele expression
Order the steps involved in analyzing codominance in inheritance:
1️⃣ Define the genetic inheritance pattern
2️⃣ Identify the heterozygous genotype
3️⃣ Express both allele traits in the phenotype
In codominance, the heterozygous phenotype combines traits from both alleles
True
Roan cattle exhibit codominance with red and white hair colors.
True
Multiple alleles are present in the population but individuals can only carry two alleles at a
time
.
True
The ABO blood group in humans is determined by three alleles: A, B, and
O
What are the four possible blood types in the ABO system?
A, B, AB, O
What is the key difference between codominance and multiple alleles in terms of allele expression?
Codominance expresses both alleles fully
What is codominance in genetics?
Both alleles are expressed
What is the phenotype of heterozygous offspring in codominance?
Combination of both alleles
What is the definition of multiple alleles?
More than two alleles
In human blood types, which alleles are codominant?
A and B
What is the significance of codominance in inheritance?
Greater diversity of phenotypes
In rabbits, the C gene controls coat color with four
alleles
.
True
Codominance and multiple
alleles
are both genetic inheritance patterns.
True
Codominance is a genetic inheritance pattern where two different alleles are both fully expressed in the
phenotype
.
True
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