Exploring Codominance Through Monohybrid Crosses and Blood Groups

The video tutorial covers monohybrid crosses, explaining the difference between genotype and phenotype. It then introduces codominance, where both alleles are expressed in the phenotype, using examples like chickens and blood groups. The tutorial details how blood group alleles IA and IB are codominant, while IO is recessive, and uses Punnett squares to illustrate possible offspring genotypes.

What is the primary focus of a monohybrid cross?

• Inheritance of multiple alleles

• Inheritance of dominant traits only

• Inheritance of one characteristic

• Inheritance of two characteristics

In a monohybrid cross, if the genotype is 'yy', what color will the peapod be?

• Green

• Yellow

• Speckled

• Blue

What is a key feature of codominance?

• One allele is always dominant

• Both alleles are expressed equally

• Only recessive alleles are expressed

• Neither allele is expressed

In chickens, what phenotype results from a BW genotype?

• Speckled

• Black

• Gray

• White

Which blood group alleles are considered codominant?

• IO and IO

• IA and IB

• IB and IO

• IA and IO

If a person inherits IA from their mother and IB from their father, what is their blood group?

• A

• B

• AB

• O

What must be true for a person to have blood group O?

• Both parents have at least one IO allele

• Both parents have IA and IB alleles

• One parent has an IA allele

• One parent has an IB allele

Which of the following is an example of codominance in animals?

• Green peapods

• Blue flowers

• Yellow peapods

• Roan horses

What is the result when neither allele takes dominance in a phenotype?

• A new allele is created

• No alleles are expressed

• Only one allele is expressed

• A mixture of both alleles is expressed

Which of the following is NOT an example of codominance?

• Yellow peapods

• Roan horses

• Blood group AB

• Speckled chickens