Ecology! Please explain the answer for all questions and why the other options i

Question

Ecology! Please explain the answer for all questions and why the other options is not correct! 11. Stickleback fish exhibit variation in a morphological trait known as gill rakers. Fish with long gill rakers are very good at eating plankton, and fish with short gill rakers are good at eating deep-water invertebrates. However, fish with intermediate-length gill rakers are poor at eating either type of food. Fish that are better at consuming food have higher survival and reproduction rates than poorer consumers. Based on this information, what type of selection is likely acting on stickleback gill raker length? (a) no natural selection (b) stabilizing selection (c) disruptive selection (d) directional selection 12. If a population of butterflies is under strong natural selection favoring large wings but there is no genetic variation for wing size, what do we expect to occur in the next generation? (a) Wings will evolve to be smaller (b) There will be no evolutionary change in wing size. (c) Wings will evolve to be larger (d) Wings will evolve to be more variable. 13. Fecundity is (a) the number of reproductive episodes of an organism. (b) the amount of overall energy expended to reproduction over the life of an organism. (c) the number of offspring produced by an organism per reproductive episode (d) the period in the life of an organism when it can produce offspring. 14. Which best describes how to estimate heritability? (a) The regression slope of mean offspring phenotype versus mean parent phenotype (b) The ratio of selection differential divided by selection response (c) Both a and b are true (d) Both a and b are false

Explanation / Answer

11. Option C is the right answer. By various observations and inferences it has been suggested that the stickleback fish undergoes disruptive selection. It was majorly based on the information that in lakes fishes with intermediate morphology showed slower growth.

Disruptive selection is when extreme traits are favored upon intermediate traits.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.