Genetics: Codominance and Inheritance

The video explores complex genetic patterns beyond Mendel's work, including incomplete dominance, codominance, multiple alleles, and polygenic traits. Incomplete dominance is illustrated with flower color and a human disease example, while codominance is explained using rhododendrons and human blood types. The concept of multiple alleles is demonstrated with blood type variations, and polygenic traits are discussed with examples like height and skin color.

What did Mendel's work with peas primarily demonstrate?

• The complexity of genetic mutations

• Simple patterns of inheritance

• The existence of DNA

• The role of environment in genetics

In incomplete dominance, what is the result when a red flower is crossed with a white flower?

• Red flowers

• No flowers

• White flowers

• Pink flowers

Which human condition is an example of incomplete dominance?

• Sickle cell anemia

• Familial hypercholesterolemia

• Cystic fibrosis

• Huntington's disease

In codominance, what is observed when a pinkish-red rhododendron is crossed with a white one?

• Only white flowers

• Only pink flowers

• Flowers with both pink and white

• No flowers

Which blood type is an example of codominance?

• Type AB

• Type O

• Type A

• Type B

What does the term 'multiple alleles' refer to?

• A gene with only two alleles

• A gene with more than two alleles

• A single allele affecting multiple traits

• Alleles that are always recessive

How many alleles are involved in determining human blood type?

• Five

• Two

• Four

• Three

What does 'polygenic traits' mean?

• Traits influenced by multiple genes

• Traits that are always recessive

• Traits that are always dominant

• Traits controlled by a single gene

Which of the following is an example of a polygenic trait?

• Blood type

• Eye color

• Cystic fibrosis

• Sickle cell anemia

What does the prefix 'poly' in polygenic traits indicate?

• Many

• None

• Few

• Single