Blood Types and Inheritance Concepts

The video tutorial explains the concept of codominance, using blood types as a primary example. It covers how alleles are expressed in heterozygous individuals, with a focus on blood types A, B, AB, and O. The tutorial also includes problem-solving exercises related to genetic inheritance and a paternity case study. Additionally, it discusses codominance in cattle hair color, highlighting the difference between codominance and incomplete dominance.

What is codominance?

• When one allele is completely dominant over another

• When two alleles are equally expressed in a heterozygous individual

• When alleles are not expressed at all

• When alleles blend to form an intermediate phenotype

Which blood type is an example of codominance?

• Type B

• Type O

• Type A

• Type AB

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

• IAIB

• ii

• IAIA

• IBIB

In a cross between a homozygous type B male and a heterozygous type A female, what is the expected phenotypic ratio of their offspring?

• All type A

• All type B

• Half type AB, half type B

• Half type A, half type O

If a male with type O blood and a female with type AB blood have children, what blood types could their children have?

• Only type A

• Only type B

• Type A and type B

• Type AB and type O

In the paternity case study, why was it impossible for Henry to be the father of both children?

• He had type AB blood

• He had type O blood

• He had type B blood

• He had type A blood

What blood type must a father have to produce a child with type AB blood if the mother is type O?

• Type A

• Type B

• Type AB

• Type O

In cattle, what does the Roan color indicate?

• Complete dominance

• Recessive trait

• Codominance

• Incomplete dominance

What would be the phenotype of cattle with both red and white hairs?

• Red

• White

• Pink

• Roan

How does codominance differ from incomplete dominance?

• Incomplete dominance results in one trait being dominant

• Codominance results in both traits being fully expressed

• Incomplete dominance results in both traits being fully expressed

• Codominance results in a blend of traits