Artificial selection Knowledge-Based Download PDF

Questions

1. 1.

   Why do phenotypic traits favored during artificial selection often result in decreased survival when domesticated organisms are released into a wild environment?

   • A) Artificial selection induces novel directional mutations that cannot function within natural metabolic pathways.
   • B) Artificial selection completely removes genetic variation across all loci, preventing any cellular response to ecological stress.
   • C) Artificial selection prioritizes traits that serve human utility or preference rather than traits that maximize ecological fitness.
   • D) Artificial selection permanently halts all natural selective pressures from acting on subsequent generations.
2. 2.

   Which condition is fundamentally required for breeders to successfully modify a specific physical characteristic in a population through artificial selection?

   • A) The trait must be acquired through behavioral conditioning during an organism's lifetime.
   • B) The target trait must confer a distinct survival advantage in the organism's natural habitat.
   • C) Heritable genetic variation for the trait must already be present in the population.
   • D) The breeder must induce novel directional mutations before each successive breeding cycle.
3. 3.

   Common agricultural vegetables such as cabbage, broccoli, cauliflower, Brussels sprouts, and kale were all developed through artificial selection from which ancestral plant species?

   • A) Wild wheat (Triticum dicoccoides)
   • B) Wild mustard (Brassica oleracea)
   • C) Wild teosinte (Zea mays subsp. parviglumis)
   • D) Wild nightshade (Solanum dulcamara)
4. 4.

   When breeders continuously select and propagate only individuals displaying a specific desirable phenotype, what is the most typical genetic consequence for the domesticated population over time?

   • A) A reduction in the overall genetic variation within the population
   • B) An increase in the spontaneous mutation rate across functional loci
   • C) An enhanced ability of the population to survive in wild, unmanaged environments
   • D) The directed creation of entirely novel alleles not previously present in the gene pool
5. 5.

   Which of the following statements best describes the primary difference between artificial selection and natural selection?

   • A) In artificial selection, humans decide which traits are favored for reproduction, whereas in natural selection, environmental pressures dictate reproductive success.
   • B) In artificial selection, humans intentionally induce beneficial mutations in each generation, whereas natural selection operates solely on existing genetic traits.
   • C) Artificial selection produces brand new functional alleles within a single generation, whereas natural selection requires millions of years to generate any phenotypic change.
   • D) Artificial selection consistently improves an organism's survival and fitness in wild environments, whereas natural selection reduces ecological adaptability.