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(#2) Non-Fused Fingers
We definitely see more free-fingered folks around than we do people with webbed or fused fingers, partially because there are so few genes of this type floating around in the population.
Only three to 10 in every 10,000 births show evidence of webbed or fused fingers.
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(#14) Straight Hair
Straight hair is another mostly recessive trait, not a trait that depends on a single recessive gene. According to the Tech Museum of Information: "There are two versions of the hair type gene, curly and straight. Hair type is an interesting case of something called incomplete dominance. What this means is that with hair type, if you have one of each version of the gene, you get a mix of the two or wavy hair."
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(#7) Non-Freckled Skin
Freckles are cute and kind of rare, but they're also a dominant trait! "If you have an active MC1R gene, your body produces more eumelanin, leading to darker hair and skin that protects against the sun," said "SciShow" host Hank Green.
"If that gene is inactive then you’ll produce more pheomelanin, leading to fairer skin, blonde or red hair and a propensity for freckles."
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(#11) Not Being Nearsighted
Nearsightedness is thought to be a recessive trait, but one gene alone doesn't determine how good your vision is. According to the Tech Museum of Information: "The genetics of poor eyesight are too complicated to be a simple dominant or recessive trait. Something like 'nearsightedness' is probably made up of more than one disease and each disease probably has more than one gene involved!"
Nearsightedness is on the rise - it's believed one in every three people will be nearsighted by 2020.
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(#4) Hair Without White Streaks
You don't see a lot of people walking around with Bride-of-Frankenstein hair. So you might be surprised to know that having streakless hair, as the majority of people do, is a recessive trait.
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(#12) Blue Eyes
According to the Tech Museum of Information, "blue eyes are mostly recessive." The trait's not truly recessive because it depends on two genes, OCA2 and HERC2.
"Both come in versions that can cause blue eyes," wrote Dr. Barry Starr of Stanford University. "And they need each other to work."
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About This Tool
Only when the gene is homozygous, the trait determined by the Recessive gene will be expressed. In the heterozygous state, the phenotype of the organism shows the characteristics determined by the dominant gene. Recessive genes in biology are represented by lowercase letters, while dominant genes are represented by uppercase letters. For example, a recessive homozygote is denoted as aa, and a heterozygote is denoted as Aa.
An example of a recessive gene is the blue eyes, which are recessive genes compared to brown eyes. The random tool introduces 15 of the most common recessive genes in humans that you may find in your own body, such as non-fused fingers, type O blood, etc.
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