Blood Type Genetics and Alleles

The video tutorial explains the genetic basis of blood types, focusing on the alleles for blood types A, B, and O. It describes how the A and B alleles are dominant over the O allele and how they are represented in genetic notation. The concept of co-dominance is introduced, where both A and B alleles express equally in the phenotype, resulting in blood type AB. The tutorial also covers inheritance patterns, explaining how different combinations of alleles from parents result in various blood types in offspring.

What is the representation for the allele of blood type A?

• Lowercase i

• Capital I with a superscript A

• Lowercase a

• Capital I with a superscript B

If a person is homozygous for blood type O, what is their allele representation?

• Lowercase o

• Capital I with a superscript A

• Capital I with a superscript O

• Lowercase i

How is the B allele represented in terms of blood type?

• Lowercase b

• Capital I with a superscript B

• Lowercase i

• Capital B

What happens when a homozygous B individual has children with a homozygous O individual?

• All children are co-dominant

• All children are blood type O

• All children are heterozygous with blood type B

• All children are blood type A

What did Mendel not observe in his studies of allele interactions?

• Co-dominance between A and B alleles

• Inheritance patterns

• Dominance of one allele over another

• Recessive traits

What is the phenotype of a child with both A and B alleles?

• Both A and B

• Only A

• Only B

• Neither A nor B

What term describes the inheritance pattern where both A and B alleles are expressed?

• Co-dominance

• Dominant inheritance

• Recessive inheritance

• Incomplete dominance

In a cross between heterozygous A and heterozygous B individuals, what fraction of children are expected to be blood type AB?

• 3/4

• 1/4

• 1/2

• None

What fraction of children from heterozygous A and B parents will have blood type O?

• 1/4

• 1/2

• 3/4

• None

If both parents are heterozygous for A and B alleles, what is the probability of having a child with blood type A?

• None

• 3/4

• 1/2

• 1/4