Down Syndrome, Caused by an Extra Copy of Which Chromosome

question 96

Multiple Choice

Down syndrome, caused by an extra copy of which chromosome, is the best known chromosomal abnormality largely because its effects are less lethal than those of other chromosomal defects and most affected infants survive?

• A) Chromosome 4
• B) Chromosome 9
• C) Chromosome 17
• D) Chromosome 21

---

Definitions:

Countertrade

The practice of using barter rather than money for making global sales.

Media Advertising

The use of various media channels, such as TV, radio, and digital platforms, to promote products, services, or brands to a wide audience.

Surplus

An excess of something, such as goods, services, or resources, beyond what is needed or used.

Balance of Trade

The difference in value between a country's imports and exports over a certain period.