Master Regulatory Genes That Turn on Entire Programs of Development

question 66

Multiple Choice

Master regulatory genes that turn on entire programs of development are often identified because loss-of-function mutations and gain-of-function mutations in the gene have opposite phenotypes. Which type of mutation is recessive? Which type of mutation is dominant?

• A)Loss-of-function mutations and gain-of-function mutations are recessive.
• B)Loss-of-function mutations are recessive; gain-of-function mutations are dominant.
• C)Loss-of-function mutations are dominant; gain-of-function mutations are recessive.
• D)Loss-of-function mutations and gain-of-function mutations are dominant.
• E)There is no predictable pattern of recessiveness or dominance.

---

Definitions:

Heritability

Refers to the proportion of variation among individuals that we can attribute to genes. The heritability of a trait may vary, depending on the range of populations and environments studied.

White Middle-Class

A socioeconomic group characterized by individuals of European descent with moderate to high income levels and education.

Japanese Males

A demographic group referring to individuals who are male and of Japanese nationality or descent.

Vocational Success

Achieving personal and professional goals within one's chosen career path, often measured by advancement, satisfaction, and work-life balance.