This episode is supported by 23andMe.
你很容易觉得 身上的特征 父母各占一半
It ’ s easy to feel like you ’ re an even mix
of your parents, but that ’ s not always the case.
因此 那些你不喜欢的特征 你应该归咎于谁？
So, who should you be blaming over those traits you don ’ t like?
What did you inherit from Mom and what camefrom Dad?
If you’re a male, you can thank your mother.
Red-green colour blindness is an X-linked
disorder that affects nearly 6 % of the male
population worldwide, but only 0.4% of females.
This is because males only inherit one X chromosome,
which is from their mother, and that ’ s where
red-green colorblindness comes from.
If you ’ re a female,
you have to get a the X-variant from both parents.
So that 0.4% can blame dad as well!
A big component comes from the X-chromosome here too,
so you likely inherited this from
your mom. However, a study involving 52,000 people found
that genes on other chromosomes can affect this condition,
on top of environmental factors
such as age, stress and diet.
so, mom isn’t entirely to blame!
Research has also found that the shape of the end
of your nose, the area above and below
the lips, cheekbones and the inner corner
of the eye are highly influenced by genetics.
And interestingly, the more they resemble your father as a child,
the healthier you’re likely to be.
Scientists believe that a father-child resemblance
causes fathers to spend more time engaging
in positive parenting, which ultimately contributesto healthier kids.
Now, even though you get half of your 46 chromosomes
from mom and the other from dad, a study involving
genetically diverse mice found that for 60 %
of genes the paternal copy was more active
than the maternal copy.
This phenomenon is known as allelic imbalance.
The same study also noted that
the brains of these particular mice more closely resembled
that of their dad than their mom.
However, in humans we actually see the opposite.
Our brains are more similar to our mother,
which is particularly true for daughters.
Interestingly, the similar brain regions areactually associated with depressive conditions,
suggesting that mood disorders may pass frommother to daughter.
Biologists used to believe that all DNA came from the nucleus,
but we now know that the
mitochondria (AKA the powerhouse of the cell)
also kicks in some protein coding genes.
And this mitochondrial DNA
is specifically inherited from your mom
because your dad ’ s degraded immediately after fertilization.
Considering how important mitochondrial DNA is
in the cell, there is a stronger maternal link.
Mutations in mitochondrial DNA have been associated
with Type 2 diabetes and Parkinson ’ s disease
– which more likely came from your mom.
Maternal inheritance gave rise to the idea of a “ Mitochondrial Eve ”,
a woman who lived between 180,000 to 580,000 years ago
from which all human mitochondrial DNA is rooted.
At the end of the day,
it may seem like a lot of traits actually come from your mom,
or at least, from the X chromosome –
and that ’ s generally true, genetically.
The Y-chromosome is very small, and doesn ’ t contain as many genes;
and both females and
males contain X-chromosomes, which carry moregenes.
But as we continue to research more about ourselves at the genetic level, the division
between what you got from mom vs. dad may become even more pronounced.
If you want to know more about your own genetics,
you can visit 23andMe.com/asap, who sponsored this episode.
Whether you want to know about your chances of balding, of getting
back hair, how your taste sense work or
who your ancestors are, 23andMe’skit will get you started.
23andMe’s kit will get you started.
We both took it, and I found out the GREAT news
that I ’ m more prone to having a little
upper back hair, which until recently I thought was FALSE,
but as I ’ ve aged Greg told me
is actually TRUE!!
-23andMe was on that.-They knew.
What I thought was cool is
that you can find out how certain factors affect your weight.
Like for me fast food is likely to
我最近在控制快餐的摄入 我很喜欢吃 但是我会少吃一些
have the biggest impact on my weight followed by exercise.
Be sure to head to 23andMe.com/asap for the latest promotion on your kit.
As always, thanks for watching, be sure to subscribe for more weekly science videos every Thursday,
and we will see you next time!