Understanding Dominance in Genetics

The video discusses various types of genetic dominance, including incomplete dominance, co-dominance, multiple alleles, and polygenic inheritance. Incomplete dominance is illustrated with flower color examples, where traits blend. Co-dominance is shown with cows and chickens, where both traits appear distinctly. Multiple alleles are explained using human blood types, controlled by three alleles. Polygenic inheritance is described with traits like height and skin color, influenced by multiple genes. The video concludes with a summary of these genetic concepts.

What did Mendel's studies primarily focus on?

• Traits influenced by a single gene or two alleles

• Traits influenced by multiple genes

• Traits influenced by environmental factors

• Traits influenced by co-dominance

What is an example of incomplete dominance?

• A person with varying skin tones

• A human with type AB blood

• A pink flower from crossing red and white flowers

• A cow with both white and brown patches

In incomplete dominance, what happens to the traits?

• Both traits are fully expressed without blending

• They blend together to form a new trait

• One trait completely masks the other

• Neither trait is expressed

Which of the following is an example of co-dominance?

• A pink flower from red and white parents

• A cow with both white and brown patches

• A person with type O blood

• A person with a single eye color

In co-dominance, how are the traits expressed?

• Neither trait is visible

• Both traits are fully expressed

• One trait is dominant over the other

• They blend together

How many alleles control human blood type?

• Two

• Three

• Four

• Five

What is polygenic inheritance?

• Multiple alleles controlling a single trait

• A single allele controlling multiple traits

• Multiple genes controlling a single trait

• A single gene controlling multiple traits

Which of the following traits is an example of polygenic inheritance?

• Coat color in cows

• Eye color

• Blood type

• Flower color in Snapdragon

What is the result of multiple alleles controlling a trait?

• A dominant phenotype

• No phenotype

• Multiple phenotypes

• A single phenotype

Which type of dominance involves both alleles appearing in the phenotype?

• Incomplete dominance

• Co-dominance

• Polygenic inheritance

• Single-gene dominance