Variability Within Native American MtDNA Lineages Suggests a Dispersal Through

question 31

Multiple Choice

Variability within Native American mtDNA lineages suggests a dispersal through the Americas about how long ago:

• A) 25,000-20,000 years ago
• B) 18,000 years ago
• C) 16,000 years ago
• D) 13,000 years ago

---

Definitions:

Alzheimer's Disease

A degenerative brain disorder leading to memory loss, cognitive decline, and personality changes, typically affecting older adults.

Fraternal Twins

Twins that develop from two different eggs fertilized by two different sperm, making them genetically unique from each other.

Identical Twins

Genetically identical siblings conceived from the same egg and sperm, sharing 100% of their DNA.

Separated Twins

Twins who have been raised apart from one another, often used in studies to understand the influence of genetics versus environment.