Fitness Knowledge-Based Practice

Questions

1. 1.

   Why can a heritable trait that reduces an individual's adult lifespan still be favored by natural selection in a wild population?

   • A) Because natural selection prioritizes the long-term survival of the species over individual reproductive output.
   • B) Because shorter lifespans prevent deleterious mutations from accumulating in the somatic tissues of the population.
   • C) Because reduced longevity consistently lowers metabolic competition for resources among older generations.
   • D) Because the trait increases total lifetime reproductive success despite shortening survival time.
2. 2.

   In evolutionary biology and population genetics, how does an individual's relative fitness differ from its absolute fitness?

   • A) Relative fitness measures the total number of surviving offspring produced over a lifetime, whereas absolute fitness accounts for physical longevity.
   • B) Relative fitness reflects survival rates under varying abiotic conditions, whereas absolute fitness is determined solely by mating frequency.
   • C) Relative fitness evaluates an individual's reproductive contribution compared to the most successful genotype in the population, whereas absolute fitness represents the total number of viable offspring produced.
   • D) Relative fitness quantifies the proportion of dominant alleles an organism carries, whereas absolute fitness measures total genetic heterozygosity.
3. 3.

   Which of the following statements best explains why an organism's evolutionary fitness is context-dependent rather than an absolute, intrinsic property?

   • A) Larger and physically stronger individuals consistently maintain the highest fitness across all ecological niches.
   • B) Fitness is strictly determined by total lifespan regardless of the number of viable offspring produced.
   • C) A heritable trait that increases reproductive success in one habitat may provide no advantage or reduce success in a different habitat.
   • D) Organisms can intentionally alter their genetic fitness whenever environmental pressures change.
4. 4.

   A biologist tracks four adult females of the same bird species in a wild population over their lifespans. Which individual has the highest evolutionary fitness?

   • A) A female that lives for 12 years, mates each season, and rears a total of 4 offspring that survive to reproduce
   • B) A female that lives for 5 years and rears a total of 14 offspring that survive to reproduce
   • C) A female that lives for 10 years, maintains the largest nesting territory, and leaves 6 surviving offspring
   • D) A female that lives for 8 years, displays the fastest flight speed, and leaves 8 surviving offspring
5. 5.

   In evolutionary biology, which statement best defines the biological fitness of an individual organism?

   • A) The physical strength, speed, and endurance an individual displays when competing with predators
   • B) The total lifespan of an individual regardless of the number of descendants produced
   • C) The relative contribution an individual makes to the gene pool of the next generation through surviving offspring
   • D) The overall complexity and health of the physiological adaptations acquired during an individual's lifetime

Answers and step-by-step solutions appear after you finish the test.