Multiple Alleles (ABO Blood Types) and Punnett Squares

The video tutorial explains the concept of phenotypes, focusing on blood types and their importance in blood donation. It covers the different blood type antigens (A, B, AB, O) and their compatibility for donation and reception. The tutorial also introduces the Rh factor and its role in blood type compatibility. A practical problem-solving example using Punnett squares is provided to illustrate genetic inheritance of blood types.

Which of the following is NOT a visible phenotype?

• Height

• Blood type

• Hair texture

• Eye color

What antigens are present on the surface of type AB blood cells?

• Only A antigens

• Only B antigens

• Both A and B antigens

• No antigens

Why can individuals with type O blood donate to anyone?

• They have no A or B antigens

• They have only B antigens

• They have both A and B antigens

• They have only A antigens

What does a positive Rh factor indicate?

• Absence of Rh protein

• Presence of B antigens

• Presence of Rh protein

• Presence of A antigens

What is the genetic term for different forms of a gene?

• Genotypes

• Phenotypes

• Antigens

• Alleles

In the hospital mix-up scenario, which baby could belong to parents with type A blood?

• Baby Sylvester with type O blood

• Baby Phil with type B blood

• Neither baby

• Both babies

What is the probability of two heterozygous type A parents having a type O child?

• 75%

• 50%

• 25%

• 0%