7 myths from biology class that most people still believe.

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

They do, however, have more rod cells 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 to them, while 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. While it may be proven to be accurate in the near future, 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

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