The idea that cave fishes lost their eyesight because generations of fish didn’t use their eyes is a Lamarckian mistake.” … The trait of blindness has a positive effect; it gives the fish an evolutionary advantage. The trait of blindness has a negative effect; it puts the fish at an evolutionary disadvantage.
Why do cave fish lose their eyes article?
The fact that cave fishes don’t use their eyes has no effect on their genes. Instead, cave fishes are blind because something happened to the genes that control the development of their eyes. This change is passed on from parent to offspring. That explains why a blind fish would have blind offspring.
Why do fish lose their eyes?
They are blind because something happened to the genes that control the development of their eyes. This change is passed on from parent tooffspring. That explains why a blind fish would have blind offspring.
Why do cavefish have no eyes ReadWorks?
The fact that cave fishes don’t use their eyes has absolutely no effect on the DNA in their chromosomes. They are blind because something happened to the genes that control the Page 3 ReadWorks Why Do Cave Fish Lose Their Eyes? development of their eyes. This change is passed on from parent to offspring.
How does the cave fish manage without eyes?
The Mexican blind cavefish does not have eyes, but it can “see” obstacles in dark caves by puckering its mouth and producing bursts of suction, according to a new study. The research describes this unique form of navigation for the first time.
Can a fish live without eyes?
Fish can live perfectly fine with only 1 eyeball. No need to euthanize. I had a piranha, actually the first batch I got of them 17 years ago, that had his eye taken out by another and he lived 10 more years.
Do blind cave fish have eyes?
Few animals have ignored the warning “use it or lose it” as spectacularly as the Mexican blind cavefish (Astyanax mexicanus), which no longer has eyes. Now scientists may have solved the riddle of why the fish lost their eyes in the dark.
Can a fish eye grow back?
Unlike what is possible with the human eye, fish are able to regenerate injuries to the retina at the cellular level. … They focus on the retina of fish, since — unlike humans — fish are able to completely regenerate all retinal nerve cells upon injury. Special glia cells take on the function of stem cells.
What happens if a fish loses an eye?
Fish have an amazing ability to heal, and as long as there are no underlying disease problems, they will frequently recover from a lost eye. Once the eye itself is gone, scar tissue will quickly fill the orbit (socket), and within a matter of several weeks, the orbit will be filled with new tissue.
Can a fish hear?
Our ears and brain translate vibrations into sounds and language. Fish hear, but their “ears” are on the inside. Bony fishes detect vibrations through their “earstones” called otoliths. Both people and fish use parts of their ears to help them with balance.
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What was the reason scientist conducted an eye transplant on the fish?
The rationale behind the experiment was that if the lens is influencing eye degeneration in cavefish, then transplanting a normal lens from surface fish early in development may be able to rescue the loss.
What kind of sensory adaptation would you hypothesize?
I think the kind of sensory adaptation that i would hypothesize is that the cave fish has special sense organs on the surface of its body that responds to the presence of different chemicals in the water environment.
Why is eyesight not important in a cave?
Explain why eyesight is not an important adaptation to life in a cave. There is NO light in a cave. All living things need light to see. Eyesight is not a sense that the cave fish can use in darkness.
What is the most important adaptation of the cave fish?
Each denticle has a rod covered with enamel, and a nerve at the base surrounded by muscle tissue. This unique adaptation assists the fish with the detection of water flow and helps him survive in fast-flowing, turbulent waters.
How do eyeless fish see?
Blind cave fish compensate for their lack of sight by having a more sensitive lateral line system which detects vibrations or changes in pressure in the water. The lateral line is a specialized sensory organ found in fish.