Genetic Disorders and Inheritance Patterns

The video concludes the unit on heredity by discussing chromosomal inheritance and genetic disorders. It covers how chromosomes are inherited, leading to genetic variation, and explores various genetic disorders. Autosomal recessive disorders like sickle cell anemia and cystic fibrosis, autosomal dominant disorders such as Huntington's disease and achondroplasia, and x-linked recessive disorders like red-green color blindness, hemophilia, and Duchenne muscular dystrophy are explained. The video also discusses codominance in Tay-Sachs disease and aneuploidy in Down syndrome.

What is the primary focus of the study of genetics?

• Understanding how traits are passed from one generation to the next

• Studying the behavior of animals

• Analyzing the chemical composition of cells

• Exploring the history of human evolution

Which of the following is an example of an autosomal recessive disorder?

• Down syndrome

• Huntington's disease

• Sickle cell anemia

• Achondroplasia

What causes sickle cell anemia?

• A mutation in the hemoglobin protein

• A deficiency in vitamin D

• An excess of red blood cells

• A viral infection

Which disorder is characterized by a lethal dominant allele?

• Red-green color blindness

• Huntington's disease

• Tay-Sachs disease

• Cystic fibrosis

What is the genetic basis of achondroplasia?

• A recessive allele

• A chromosomal deletion

• A dominant allele

• A viral infection

How does Tay-Sachs disease differ from other autosomal recessive disorders?

• It affects only males

• It is caused by a dominant allele

• Carriers produce less of the enzyme than unaffected individuals

• It is not inherited genetically

What is an example of an X-linked recessive disorder?

• Cystic fibrosis

• Huntington's disease

• Red-green color blindness

• Down syndrome

What is the cause of Down syndrome?

• A dominant allele

• A deficiency in hemoglobin

• Trisomy 21

• A viral infection

Which condition is characterized by a progressive weakening of muscles?

• Tay-Sachs disease

• Sickle cell anemia

• Achondroplasia

• Duchenne muscular dystrophy

What is aneuploidy?

• An abnormal number of chromosomes

• A deficiency in a specific protein

• A type of viral infection

• A mutation in a single gene