Down's Syndrome

The video explains Down syndrome, a genetic disorder caused by an extra copy of chromosome 21 due to nondisjunction during meiosis. It discusses the physical and cognitive characteristics of individuals with Down syndrome, the increased risk of health issues, and the impact of maternal age on the likelihood of having a child with the condition. The video also covers genetic testing options and the ethical considerations surrounding them, particularly in countries like Iceland where screening is common. The global incidence rate is about 1 in 1,000 births.

What is the term used to describe a change in the DNA structure or amount?

• Meiosis

• Chromosome

• Mutation

• Nondisjunction

How many chromosomes does a person with Down syndrome typically have?

• 45

• 46

• 48

• 47

Which of the following is a common characteristic of individuals with Down syndrome?

• Increased muscle tone

• Higher than average IQ

• Longer than average life expectancy

• Flattened facial features

What factor increases the likelihood of having a child with Down syndrome?

• Father's age

• Mother's age

• Diet during pregnancy

• Number of siblings

In which country is genetic screening for Down syndrome particularly widespread, leading to a low birth rate of affected individuals?

• Brazil

• Japan

• Iceland

• United States