Inheritance: Part 2

The video explains how genes and alleles determine traits, with dominant alleles being expressed even if only one copy is present, while recessive alleles require two copies. Eye color is used as an example, with brown being dominant over blue. Diseases like cystic fibrosis are caused by recessive alleles, requiring both parents to pass on the allele for the child to be affected. Huntington's disease, however, is caused by a dominant allele, meaning only one parent needs to pass it on. The video concludes by noting that most traits are influenced by multiple genes and environmental factors.

What determines whether a recessive allele is expressed?

Explain the difference between dominant and recessive alleles with examples.

How can two parents carry a recessive allele without having the associated disease?

What is the probability of a child inheriting a dominant allele from one parent?

Discuss how environmental factors can influence genetic traits.