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17 Times Genes Were Real Pranksters

One of our flaws as humans is our tendency to think we know everything. When something doesn’t turn out how we expected, we’re often caught by surprise. What do we know about the genes that determine who we are and what we look like?

Genes are sections or segments of DNA that determine specific human characteristics, such as height or hair color.

A gene mutation is a permanent alteration in the DNA sequence that makes up a gene and differs from most people. Here are instances when these genes have proved to be real pranksters:

1. Heterochromia is a fancy way of saying that your eyes are two different colors. According to, approximately 6 out of 1000 will inherit heterochromia, and only a handful of them will have it be visibly noticeable.


2. The Mallen streak, or poliosis, is a patch or streak of hair completely without pigment that you acquire from birth. This mutation decreases melanin in the hair, writes, and can affect eyebrows and eyelashes as well.


3. Distichiasis, or double eyelashes, is a dominant trait that’s passed down directly from a parent to future generations, writes the National Organization for Rare Disorders.


4. Medscape states Anisocoria is a common condition in which a person has unequal pupil sizes, which can often make people look like they have two different colored eyes when they don’t.

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