Autosomal Dominant Genetic Disorders

The video tutorial explains autosomal dominant inheritance using polycystic kidney disease as an example. It covers the expression of dominant and recessive genes, the formation of gametes, and the probability of inheriting the disease. The tutorial also generalizes these concepts to other autosomal dominant conditions like Huntington's chorea, emphasizing a 50% chance of inheritance for each child.

What is an example of a disease caused by an autosomal dominant gene?

• Sickle cell anemia

• Polycystic kidney disease

• Hemophilia

• Cystic fibrosis

In the context of genetic inheritance, what does it mean for a gene to be dominant?

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

• It is expressed only in males.

• It is only expressed when two copies are present.

• It is never expressed.

What is the phenotypic result of having two recessive alleles for a trait?

• No trait is expressed.

• Both traits are expressed equally.

• The recessive trait is expressed.

• The dominant trait is expressed.

How does the presence of a dominant gene affect the expression of a recessive gene?

• The recessive gene is always expressed.

• The recessive gene is never expressed.

• The recessive gene is expressed only if the dominant gene is absent.

• The recessive gene is expressed only in females.

What is the genotype of a person who is heterozygous for polycystic kidney disease?

• Pp

• pP

• pp

• PP

What is the probability that a child will inherit polycystic kidney disease if one parent is heterozygous?

• 25%

• 100%

• 50%

• 75%

What is the chance of a child being phenotypically normal if one parent is heterozygous for a dominant disease?

• 75%

• 50%

• 25%

• 0%

What is the genetic makeup of a person who does not have polycystic kidney disease?

• PP

• Pp

• pp

• pP

What advice can be given to potential parents where one partner has polycystic kidney disease?

• There is a 100% chance of having an affected child.

• There is a 75% chance of having an affected child.

• There is a 50% chance of having an affected child.

• There is a 25% chance of having an affected child.

Which of the following is also an autosomal dominant condition like polycystic kidney disease?

• Huntington's chorea

• Cystic fibrosis

• Thalassemia

• Sickle cell anemia