Consider a Trait Determined by a Rare, Simple Mendelian, Autosomal

question 54

Multiple Choice

Consider a trait determined by a rare, simple Mendelian, autosomal recessive allele. What is the concordance between identical twins? Between same-sex fraternal twins?

• A)identical concordance = 1; fraternal concordance = 0.071
• B)identical concordance = 1; fraternal concordance = 0.143
• C)identical concordance = 1; fraternal concordance = 0.250
• D)identical concordance = 1; fraternal concordance = 0.333
• E)identical concordance = 1; fraternal concordance = 0.500

---

Definitions:

Physiological System

A group of organs working together to perform complex functions necessary for life and maintaining homeostasis within the body.

Hypothalamic-Pituitary-Adrenal Axis

A complex set of direct influences and feedback interactions among the hypothalamus, pituitary gland, and adrenal glands regulating stress response, digestion, immune system, mood, and energy usage.

Health Anxiety

A condition characterized by excessive worry about having a serious illness, despite medical reassurance.

Dysfunctional Beliefs

Negative, often unrealistic thoughts that may contribute to and exacerbate emotional disorders and distress.