QUESTION1 Acording tothe typothesis tested by Moran et al.(2015), what lfrence b

Question

QUESTION1 Acording tothe typothesis tested by Moran et al.(2015), what lfrence between caves compared to surface environments was a primary factor leading to the loss of eyes in Mexican blind cavefish? O change in types of predators O reduced food availability O absence of light O increased oxygen QUESTION 2 Which of the following was shown by the experiment conducted by Moran et al. (2015) O Mexican blind cavefish with smaller brains had higher reproductive success than those with larger brains. O Vision has a high energetic cost for eyed Mexican tetras compared to Mexican blind cavefish. Mexi O All of the above ican blind cavefish lost their sight becaus e of the metabolic cost of vision. Click Saue and Submit to save and submit. Click Save All Answers to save all Save All A

Explanation / Answer

1) answer is b)Reduced food availability. In the article, it is mentioned that maintaining neural circuit is costly but the availability of food in the cave is less so fishes have lost their eyesight, which is not helpful in dark cave conditions. Such that they can reduce the energy cost of maintaining eyesight so that they can use the energy for other purposes.  

2) answer is d) all of the above. From the observations given in the article, it is mentioned that the brain size of cavefish is less compared to surface fish, means small brain size is selected in cavefish this indicates smaller brain size is providing a greater reproductive advantage for cavefishes. Vision requires energy for those fish having the eye requires more energy compared to the one which lacked eyesight, because energy is required for maintaining neural circuit. Cavefish have lost eyesight because of the metabolic cost of vision because vision requires more energy maintaining ions in nerves using ion pumps etc.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

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