Incomplete Dominance Versus Co-Dominance in Genetics

The video tutorial explains the differences between incomplete dominance and co-dominance, which are non-Mendelian inheritance patterns. Incomplete dominance occurs when the dominant allele does not fully express itself, resulting in a blended phenotype, such as pink flowers from red and white parents. Co-dominance, on the other hand, results in both alleles being expressed equally, leading to a phenotype that shows both traits, like a white flower with red spots. The video uses examples of flower color to illustrate these concepts and compares them to Mendelian inheritance.

What is a key difference between Mendelian inheritance and the concepts of incomplete dominance and co-dominance?

• Mendelian inheritance involves blending of genes.

• Incomplete dominance and co-dominance follow Mendel's laws strictly.

• Incomplete dominance and co-dominance involve interaction between alleles.

• Mendelian inheritance allows for new phenotypes in F1 generation.

In the context of incomplete dominance, what happens to the dominant allele?

• It completely suppresses the recessive allele.

• It is not present in the F1 generation.

• It fails to express fully in the next generation.

• It blends with the recessive allele.

What is the phenotypic ratio observed in the F1 generation for incomplete dominance?

• 3:1

• 1:2:1

• 1:1:2

• 2:1:1

In a monohybrid cross showing incomplete dominance, what new phenotype is observed?

• Only the dominant phenotype.

• Only the recessive phenotype.

• A completely new phenotype unrelated to parents.

• A blend of the two parental phenotypes.

How does co-dominance differ from incomplete dominance in terms of allele expression?

• Only one allele is expressed in co-dominance.

• Both alleles are equally expressed in co-dominance.

• Alleles blend in co-dominance.

• Neither allele is expressed in co-dominance.

What is the phenotypic result of a co-dominant cross between red and white flowers?

• All red flowers.

• All white flowers.

• Pink flowers.

• White flowers with red spots.

In co-dominance, what is the phenotypic ratio observed in the F1 generation?

• 3:1

• 1:2:1

• 1:1:2

• 2:1:1

What is a major difference between incomplete dominance and co-dominance?

• Incomplete dominance results in a blend, co-dominance shows both traits.

• Co-dominance results in a blend, incomplete dominance shows both traits.

• Both result in a blend of traits.

• Neither results in a new phenotype.

In incomplete dominance, what is the result of crossing a red and a white flower?

• All red flowers.

• All white flowers.

• Pink flowers.

• Red flowers with white spots.

Which of the following best describes co-dominance?

• One allele is completely dominant over the other.

• Both alleles are expressed equally in the phenotype.

• Alleles blend to form a new trait.

• Neither allele is expressed in the phenotype.