Dominant allele

The video explains the concept of genetic dominance, where certain alleles take precedence over others in determining traits, even if only one copy is present. A classic example is human eye color, where the brown allele is dominant over the blue allele. If a child inherits a brown eye color allele from one parent and a blue allele from the other, the child will have brown eyes.

What does it mean when an allele is described as dominant?

• It is always expressed, even if only one copy is present.

• It is expressed only in the presence of a recessive allele.

• It is only expressed when two copies are present.

• It is never expressed.

Which eye color allele is dominant in humans?

• Blue

• Green

• Hazel

• Brown

If a child inherits a brown allele from one parent and a blue allele from the other, what will be their eye color?

• Blue

• Green

• Brown

• Hazel

What is the result when a dominant allele is paired with a recessive allele?

• Both traits are expressed equally.

• The dominant trait is expressed.

• Neither trait is expressed.

• The recessive trait is expressed.

In the context of eye color, what does the term 'allele' refer to?

• A version of a gene

• A type of eye color

• A dominant trait

• A genetic mutation