The Identical Twin of a Gay Man Has a 50

question 87

Multiple Choice

The identical twin of a gay man has a 50% chance of being gay,but the fraternal twin of a gay man has only a 15% chance of being gay.This phenomenon suggests that:

• A)genetic factors completely determine sexual orientation in men.
• B)environmental factors completely determine sexual orientation in men.
• C)genetic factors play a minor role in influencing sexual orientation in men.
• D)genetic factors play a large role in influencing sexual orientation in men.

---

Definitions:

Natural Selection

The evolutionary process by which organisms better adapted to their environment tend to survive and produce more offspring.

Common Ancestor

The most recent shared ancestor among two or more species or individuals, indicating a point of divergence in evolutionary history.

Evolutionary Theory

Evolutionary theory is the scientific explanation for the diversity of life, asserting that species change over time through natural selection and genetic variation.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of DNA.