Herencia (segunda parte)

The video tutorial explains how cells determine which gene versions, or alleles, to express. It covers the difference between dominant and recessive alleles, using eye color as an example. Diseases caused by recessive alleles, like cystic fibrosis, and those caused by dominant alleles, like Huntington's disease, are discussed. The video also highlights that most traits are influenced by multiple genes and environmental factors.

What is the main difference between dominant and recessive alleles?

• Dominant alleles require two copies to be expressed.

• Recessive alleles are always expressed with one copy.

• Dominant alleles are expressed with one copy, while recessive alleles need two.

• Recessive alleles are never expressed.

Which eye color allele is dominant?

• Hazel

• Brown

• Green

• Blue

What is the probability of a child developing cystic fibrosis if both parents are carriers?

• 1 in 2

• 1 in 4

• 1 in 5

• 1 in 3

How many defective alleles are needed for Huntington's disease to manifest?

• None

• Three

• Two

• One

What factors, besides genes, influence a person's traits?

• Exercise alone

• Diet alone

• Environment and lifestyle

• Only genes