Recessive allele

The video explains recessive alleles, which require two copies to be expressed. Using blue eyes as an example, it illustrates how a recessive trait is inherited from both parents. It contrasts this with dominant traits, like brown eyes, which only need one allele to be expressed.

What is a recessive allele?

• A gene version that is always expressed

• A gene version that is expressed only if two copies are present

• A gene version that is never expressed

• A gene version that is expressed with one copy

In humans, what is an example of a recessive trait?

• Brown eyes

• Blue eyes

• Green eyes

• Hazel eyes

How can an individual have blue eyes?

• By inheriting a blue allele from one parent

• By inheriting a blue allele from both parents

• By inheriting a brown allele from both parents

• By inheriting a green allele from one parent

What happens when an individual inherits one brown and one blue allele?

• They have hazel eyes

• They have brown eyes

• They have green eyes

• They have blue eyes

Which allele is dominant in determining eye color?

• Blue allele

• Hazel allele

• Green allele

• Brown allele