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如果真的近亲繁衍会导致什么? – 译学馆
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如果真的近亲繁衍会导致什么?

What Happens When You Inbreed?

在我们追求真爱的过程中
On your quest to find love, and
可能会孕育后代 许多人觉得
possibly have offspring, many of us cringe at the idea
和近亲或远亲交配既尴尬又奇怪
of mating with a sibling or any relative really, weird.
但近亲交配的第一大麻烦是什么呢?
But what’s the big problem with incest in the first place?
近亲交配会带来什么呢?
What actually happens when you inbreed?
首先 你要了解自己的生物特征是如何形成的
The first thing to understand is how any trait you have comes about.
你的生母和生父
You have your
各自有着独特的DNA
biological mom and your dad who each have their own unique DNA.
通常情况下
And, basically,
你会遗传生父生母各一半的DNA
you get half of your DNA from mom and half from dad.
这些DNA对决定你的所有生物特征
These DNA pairs define everything about you,
有时候 某些特征是显性的
but in some cases, certain traits are more dominant;
比如棕色眼睛
like brown eyes for example.
如果你的母亲有两对棕色眼睛的等位基因
If your mom has two pairs of the brown eye allele,
她的眼睛就是棕色
her eyes will be brown, and if your
如果你的父亲有两对蓝色眼睛的等位基因
dad has two pairs for the blue eyes, his
他就是蓝眼睛 而你
will be blue as a result, you’ll receive
会获得一条母亲的棕色眼睛基因
one brown gene from mom and one blue
和一条父亲的蓝色眼睛基因 但因为棕色眼睛是显性基因
gene from dad but brown eyes just happened to be a dominant
即使你从父母那分别获得了一条棕色眼睛基因和一条蓝色眼睛基因
trait meaning even though you get one brown and one blue from
你的眼睛还是棕色的
each parent, your eye color will actually be brown.
如果要表现隐性特征
It takes having two
则需要两条隐性特征的等位基因
recessive alleles to exhibit the other traits in this case
如果你获得了两条蓝色眼睛的等位基因
if you got two blue alleles,
你就是蓝眼睛
you’d end up having blue eyes.
那么 这和近亲交配有什么关系呢
So what does this have to do
事实上 许多特殊疾病
with incest it turns out that many specific diseases,
都是隐性的
or disorders, are recessive and require you
都需要遗传父母各自的隐性基因才能体现出来
to get the gene from both your mother and father.
父母能够各自携带带一条致病的隐性基因并始终保持健康
They can each carry one and be perfectly healthy,
但他们是携带者
making it difficult to know that they are carriers.
因此
As a result,
如果你的父亲有一条疾病的等位基因
if your dad has one allele for a disorder
他的近亲或远亲很有可能也是如此
it’s pretty likely that his sibling or
因为他们都可能是
relative probably has it too because they would
从父母或其他的亲戚处遗传来的
have gotten it from their parents or other
你的父亲若决定在茫茫人海中随便找个人约会
relatives had your dad decided to mate with a random person in the population,
这个人携带相同的隐性基因的可能性
the chance of them having the same recessive
微乎其微 但如果他选择
gene is low, but if he chooses to copulate
和他的姐妹或表亲交配
with his sister, or cousin,
那么你获得两条隐性基因的几率就会大很多
then your odds of getting both of the recessive genes are much higher;
并不能说百分之百
still not guaranteed,
但真的不低
but much more likely. In that sense
从这个角度来说 我们要记住
It’s important to remember
近亲交配并不会导致基因突变或产生不良后代
that inbreeding doesn’t create genetic mutations or defective offspring itself, but instead
但会提高产生罕见基因组合的概率
increases the chance of a rare gene combination
事实上 即使父母双方都携带一条隐性基因
in fact even when both parents carry a recessive gene,
仍有75%的概率
there’s still a 75 % chance that they
无法遗传该基因
won’t both pass on the gene leading to
孩子能保持健康
perfectly healthy kids with respect to that particular
不被特殊疾病困扰
disorder or disease. So,
那么 近亲交配有好处吗
is inbreeding ever good?
对人类来说 确实没什么好处
Not so much in humans,
但有些动植物靠近亲交配繁殖后代
but we rely on it in some plants and animals;
事实上 不同种类的狗就是杂交的结果
in fact different dog breeds are the result of reading?
这些狗拥有相似的理想性状 如毛色 高度
relatives with similar desirable traits, like coat color, height,
或鼻子尺寸
or snout size,
同时 我们也能从中看到近亲交配的风险
but we can even see the risk in dogs
许多纯种狗会存在臀围
with many purebred suffering from hip problems,
眼睛或其他疾病
eye problems, and more;
而杂种狗或父母基因不同的狗会更健康
while mutts or dogs with genetically diverse parents tend to be healthier.
感谢收看我们的视频 本视频主要讨论近亲交配 希望你喜欢它
Thanks for tuning in to our video, that’s (that is) kind of about incest. We really hope that you enjoyed it
所有事物都蕴藏科学道理
there’s science in everything people.
并不是近亲交配的某部分 而是全过程
Not just kind of incest, it was fully about incest.
没错
Yeah,
是近亲交配的全过程
fully about incest.
如果你想观看更多的视频
If you want to watch more of our videos.
下面是一些我们的视频链接
We’ll put some extras over here. Also,
别忘了订阅我们的频道
make sure you subscribe to our channel,
我们下周再见 祝各位平安
and we will see you next week for another video, peace!

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视频概述

近亲交配会导致基因突变吗?本视频用生物学知识向我们阐述了近亲交配可能带来的问题。

听录译者

收集自网络

翻译译者

九酱

审核员

审核员 GK

视频来源

https://www.youtube.com/watch?v=VNr5FyZp9rI

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