7 myths you “learned” in biology class that you probably still believe

7 myths you “learned” in biology class that you probably still believe

https://ift.tt/2HVUVXH

Science classes are supposed to give students, not only the most up-to-date knowledge and information, but a belief in the scientific method, and perhaps imbue them with the logic and reasoning skills associated with it. Trouble is, there are a lot of myths circling around out there that sabotage these lofty goals. In fact, many of them originate in science classes themselves. Despite already being debunked, they persist. Here are 7 commonly held myths from biology class you probably still believe.

1. Humans sit atop the food chain

Food web. Credit: Socratic.

Sometimes you’ll hear the carnivorous among us exclaim, “I didn’t fight my way to the top of the food chain to eat a salad.” Though we may understand their meaning, the concept behind it is dead wrong. That’s because the food chain metaphor itself is too simplistic. It’s more like a food web. A food web is the complex pattern that more accurately portrays how energy is passed among organisms in a certain ecosystem.

Food webs are made up of food chains, which are when energy is transferred up in a linear fashion. The trouble with the food chain is, there are usually multiple organisms who are both predator and prey. Many organisms can eat multiple things and conversely be consumed by multiple predators. The food chain model also often ignores the producers at the bottom. As such, a food web, although still imperfect, is a far more precise model.

2. Respiration is synonymous with breathing

Cellular respiration. Credit: Sheri Amsel, Exploring Nature.

Most people think respiration and breathing are the same thing. That’s nowhere near true. While we’ve got a good handle on what breathing is, respiration is when muscles release glucose during physical activity, say exercise. Glucose is the body’s fuel. We use it for energy. This misconception may be due to the fact that study of the respiratory system focuses mainly on breathing.

3. Cats and dogs are colorblind

Credit: Stocksnap, Pixababy.

The reason for the pervasiveness of this myth might be due to the fact that vision in these species working much differently than ours. Shockingly, recent research finds both dogs and cats can see the colors green and blue. But not quite like us. Dogs have fewer cones than us. These cells sense color. So the color in a dog’s vision is 1/7th less vivid than ours.

They also have more rods in their eyes than humans. These cells sense light. This means dogs have better night vision than we have. With cats, colors look completely different. Purple for instance may look more blue, while to red and pink appear as different shades of green.

4. Sugar is as addictive as cocaine

Credit: Getty Images.

This comes from the bestselling book by Dr. Robert Lustig, Fat Chance. First published in 2009, it claimed that sugar stimulates the brain’s reward system in much the same way as drugs do, such as cocaine, heroin, and alcohol. One problem though, although sugar may in fact trigger dopamine, no scientific studies using neuroimaging have ever backed up this claim.

Since we don’t even know what addiction looks like in the brain, just yet, we can’t know that sugar registers the same way cocaine does. There’s no way currently to substantiate this statement.

5. Daughters inherit traits from their mothers and sons from their fathers

Autosomal recessive inheritance. Credit: Cburnett, Wikipedia Commons.

Genetics is fun, isn’t it? It can also be a tad confusing. Most people carry this misconception from when they learned how we inherit traits. It’s true that an offspring inherits an allele from each parent.

But the characteristic that is taken by the organism happens to be the dominant one, regardless of which parent it came from or the sex of the offspring. Another common misconception is that we get half of our characteristics from each parent. The truth, all that matters is which alleles are dominant.

6. Sharks can smell one drop of blood in the water from a mile away

A great white shark. Credit: Skeeze, Pixababy.

It’s a scary thought, but does the claim stand up under scientific scrutiny? Just know that no shark is darting for your swim trunks from miles away. Sharks have highly developed brain regions for sensing odors. They can pick up 1 part of blood per 10 billion parts of water.

That isn’t miles in distance, merely the size of an Olympic swimming pool, still impressive nevertheless. Molecules of course scatter and drift in the water and there are loads of them in the ocean. The best a shark could do is pick up blood from a couple of football fields away, if the currents and other conditions are just right. A mile is way too far.

7. Humans evolved from chimps

A chimpanzee in the Leipzig Zoo. Credit: Thomas Lersch, Wikipedia Commons.

While the chimpanzee may be our closest living relative (homo sapiens are equidistant from them and bonobos), we didn’t evolve from them per se. Rather, chimps, gorillas, and humans share a common ancestor that walked the Earth some 6-10 million years ago. A recently unearthed fossil from Kenya’s Rift Valley may be the common threat. This has tentatively been identified as the Nakali ape (Nakalipithecus nakayamai). So how closely related are we to chimps? We share 98.8% of the same genes.

For more such misconceptions, click here:

TECH|SCI

via Big Think http://bigthink.com/

April 29, 2018 at 12:00PM

Advertisements

What do you think about this?

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s