So a very interesting part of biology of that.

从生物学角度来看很有意思的事
Let's talk about genes and body weight.

我们来讲下基因和体重的问题
How much is body weight affected by genes?

基因对体重的影响有多大呢
Well it's affected a lot by behavior of course-how much one eats.

实际上饮食对体重的影响比较大
It's affected a lot by culture, I mean

我的是说饮食文化对体重的影响很大
we've got rampant things like obesity in the United States,

在美国有很多人都过度肥胖
you've got almost none of it in a country like Somalia,

在索马里你是看不到肥胖症患者的
but then biology is also an important player potentially.

但是生物遗传因素也扮演着重要的角色
I'd like to have you guys do a little vote with your clickers

我想让你们来做个投票测试
and I'd like you to estimate--now somebody responded already

我让你们预测下在我描述这个问题之前
before I've described the question but maybe it doesn't matter.

好像已经有人作答了这没有关系
How much of the variation in body weight in a population

遗传学对人类的体重