Genetics: Incomplete Dominance and Co-Dominance

The video tutorial covers genetic inheritance patterns, focusing on co-dominance and incomplete dominance. Co-dominance is explained with examples like cattle fur and human blood types, where both alleles are equally expressed. Incomplete dominance is illustrated with examples such as flower colors, where alleles blend to create a new phenotype. The video includes practice problems to reinforce understanding and concludes with a summary of the key differences between the two patterns.

What is the key characteristic of co-dominance?

• Both alleles are equally expressed.

• Both alleles are recessive.

• One allele is partially dominant.

• One allele is completely dominant over the other.

In the context of blood types, which alleles are considered co-dominant?

• A and O

• B and O

• A and B

• O and O

Which of the following is an example of co-dominance in humans?

• Skin color

• Height

• Blood type AB

• Eye color

What is the genotype of a person with type O blood?

• AA

• AB

• BB

• OO

What is the probability of a child having type AB blood if one parent is heterozygous for type A and the other is heterozygous for type B?

• 0%

• 25%

• 50%

• 75%

In a Punnett square, what does a heterozygous genotype indicate?

• Only dominant alleles

• Only recessive alleles

• Two different alleles

• Two identical alleles

How does incomplete dominance differ from Mendel's findings?

• It involves only recessive alleles.

• It follows the same pattern as Mendel's findings.

• It involves only dominant alleles.

• It results in a blend of parental traits.

In incomplete dominance, what phenotype results from a red and a white flower cross?

• Red

• White

• Pink

• Purple

What is the probability of obtaining a heterozygous fish when crossing a blue male and a green female fish?

• 50%

• 25%

• 0%

• 75%

In a cross between two pink carnations, what is the probability of obtaining a red flower?

• 50%

• 25%

• 75%

• 0%