When Three of the Four Alpha Genes Are Deleted, the Disorder

question 10

Multiple Choice

When three of the four alpha genes are deleted, the disorder is known as what?

• A)α-thalassemia
• B)β-thalassemia
• C)Hydrops fetalis
• D)Hemoglobin H disease

---

Definitions:

Confounding Variable

A variable that is not controlled in a research investigation. In an experiment the experimental groups diĉer onboth the independent variable andthe confounding variable.

Internal Validity

Refers to how well an experiment is conducted and whether it measures what it's supposed to measure, without being confounded by other factors.

Independent Variable

A variable in an experiment that is manipulated to observe its effects on a dependent variable.

Internal Validity

The extent to which a study provides evidence that a causal relationship exists between the variables it examines, free from confounding factors.