Incomplete Dominance and Codominance

What is incomplete dominance?

• Incomplete dominance is a form of inheritance where the heterozygous phenotype is the same as one of the homozygous phenotypes.

• Incomplete dominance is a form of inheritance where the heterozygous phenotype is completely different from the homozygous phenotypes.

• Incomplete dominance is a form of inheritance where the heterozygous phenotype is a combination of the two homozygous phenotypes.

• Incomplete dominance is a form of inheritance where the heterozygous phenotype is a blend of the two homozygous phenotypes.

Give an example of incomplete dominance.

• Snapdragons

• Daisies

• Roses

• Tulips

What is codominance?

• Codominance is when only one allele of a gene is expressed in the phenotype of a heterozygous individual.

• Codominance is when the phenotype of a heterozygous individual is a blend of the phenotypes of the two alleles.

• Codominance is when the phenotype of a heterozygous individual is determined by the dominant allele only.

• Both alleles of a gene are expressed equally in the phenotype of a heterozygous individual.

Give an example of codominance.

• O blood type

• A blood type

• B blood type

• AB blood type

What happens in incomplete dominance when two different alleles are present?

• A new phenotype is produced that is a blend or intermediate of the two alleles.

• The dominant allele completely masks the recessive allele.

• The recessive allele completely masks the dominant allele.

• The two alleles combine to form a completely new phenotype.

What happens in codominance when two different alleles are present?

• The alleles combine to form a new phenotype that is different from either parent allele.

• Both alleles are expressed and contribute to the phenotype.

• The alleles cancel each other out and no phenotype is expressed.

• Only one allele is expressed and contributes to the phenotype.

What is the result of incomplete dominance in terms of phenotype?

• Dominant phenotype

• Blending or intermediate phenotype

• Recessive phenotype

• No phenotype

What is the result of codominance in terms of phenotype?

• Expression of one allele

• Expression of no alleles

• Expression of only the dominant allele

• Expression of both alleles

What is the difference between incomplete dominance and codominance?

• Incomplete dominance is the equal expression of both alleles, while codominance is the complete dominance of one allele over another.

• Incomplete dominance is the complete dominance of one allele over another, while codominance is the partial expression of both alleles.

• Incomplete dominance is an intermediate blend of phenotypes, while codominance is the equal expression of both alleles.

• Incomplete dominance is the absence of any expression of alleles, while codominance is the partial expression of both alleles.

How are incomplete dominance and codominance similar?

• Incomplete dominance and codominance are similar in that they both involve the expression of only one allele in a heterozygous individual.

• Incomplete dominance and codominance are similar in that they both result in the complete dominance of one allele over the other in a heterozygous individual.

• Incomplete dominance and codominance are similar in that they both involve the expression of multiple alleles in a heterozygous individual.

• Incomplete dominance and codominance are similar in that they both involve the expression of two different alleles in a heterozygous individual.