He called this hidden trait the recessive trait.

Even though I have a recessive trait here, the brown eyes dominate.

Then all of a sudden, this is a recessive trait, but there's nothing to dominate it.

I started with this phenotype blue eyes, but I know, since blue is a recessive trait, that they must have two copies of the recessive allele.

And in general for any sex linked trait, if it's recessive, if it's a recessive sex linked trait, which means men, if they have it, they're going to show it, because they don't have another X chromosome to dominate it.

Focal hyperhidrosis is found to start during adolescence or even before and seems to be inherited as an autosomal dominant genetic trait.

Carpenter Syndrome is an autosomal recessive disease which means both parents must have the faulty genes in order to pass the disease onto their children.

Out of the 16, there's only one situation where I inherit the recessive trait from both parents for both traits.

It is recessive.

O is recessive.

O is recessive.

So these 22 pairs right there, they're called autosomal.

Blue eyes are recessive.

Two points about recessive mutations are important.

It's a family trait.

O is recessive, while these guys are codominant.

The trait that has enabled us to survive is the very trait that has suppressed us

Like recessive genes, they sometimes suddenly re express themselves.

And they're recessive mutations. So what does that mean?

I introduced that tooth trait before.

What could this trait be for?

I'm afraid it's a family trait.

And let's say we have another trait.

Studies show that mutations in this gene are responsible for approximately 25 of autosomal dominant forms of RP.

So let me pick another trait hair color.

So let's say that brown eyes are dominant and blue are recessive.

This is a gender linked trait, by the way.

Then you could talk about a trait like blending.

That is a common trait of the colonial empire.

This trait also tells us a lot about politics.

They've each a trait that seems to state firstraters

Well, in order to have blue eyes, you have to be homozygous recessive.

What happens is you have a combination here between codominance and recessive genes.

For example, human height is a trait with complex causes.

The main researcher of this trait, Robert McCrae says that,

And if I want to be recessive on both traits, so if I want

This chromosome 3, maybe it contains this trait for hair color.

Language really is the most potent trait that has ever evolved.

One study that directly compared a type instrument (the MBTI) to a trait instrument (the NEO PI) found that the trait measure was a better predictor of personality disorders.

This fused jaw trait is something the entire family has in common.

No selection is taking place, no natural selection based on this trait.

So it seems that the only trait that survives decapitation is vanity.

My dad has the brown eyed dominant allele and he also has the blue eyed recessive allele.

It's just necessary or interesting that it might have one good, unique trait.

And when that happens, in Mendel's honor, we call that a Mendelian trait.