Blood Group Genetics and Genotypes

The video tutorial explains the concept of blood groups, focusing on the alleles I^A, I^B, and i. It describes how these alleles determine the antigens present on red blood cells, with I^A and I^B being co-dominant and i being recessive. The tutorial covers the four possible blood group phenotypes: A, B, AB, and O, and their associated genotypes. It provides an example of a genetic cross between a father with blood group AB and a mother heterozygous for blood group A, using a Punnett Square to predict the possible genotypes and phenotypes of their offspring.

Which alleles are responsible for the presence of antigens on red blood cells?

• I^B and i

• I^A and I^B

• I^A and i

• i and i

What is the relationship between the alleles I^A and I^B?

• They are co-dominant

• I^A is dominant over I^B

• They are recessive

• I^B is dominant over I^A

Which genotype corresponds to blood group O?

• I^A I^B

• i i

• I^B I^B

• I^A I^A

What are the possible genotypes for blood group A?

• I^A I^A and I^A i

• i i and I^A I^B

• I^B I^B and I^B i

• I^A I^B and I^B i

If a father has blood group AB, what is his genotype?

• I^B I^B

• i i

• I^A I^A

• I^A I^B

What is the genotype of a mother who is heterozygous for blood group A?

• i i

• I^A I^A

• I^A i

• I^B I^B

How many different genotypes are possible for the offspring of a father with AB blood group and a heterozygous A mother?

• Five

• Four

• Three

• Two

What is the probability of the offspring having blood group A from the given genetic cross?

• 100%

• 75%

• 50%

• 25%

Which blood group has only one possible genotype?

• B

• O

• A

• AB

What is the phenotypic ratio for blood group B in the offspring?

• 25%

• 100%

• 75%

• 50%