People have two versions (known as alleles) of each gene, one from each parent.

人类拥有分别来自父亲与母亲的两个血清素基因，每个基因有两种版本（被称为等位基因）。

But they may have different alleles, which are alternatives of the same genes.

但是他们可能有不同的等位基因，这些等位基因是相同基因的替代品。

Each of our genes can come in different flavors, called alleles.

我们的每一种基因都有不同的形式，称为等位基因。

For each gene, humans inherit one allele from each parent, and many plants do, too.

对每个基因，人类从每个亲本一个等位基因，许多植物也是如此。

The tornado was totally random, but resulted in major allele changes to the population!

这场龙卷风是完全随机的，但导致了番茄种群的主要等位基因变化！

Alleles are the parts of a chromosome that encode specific genetic traits.

等位基因是染色上编码定征的部分。

Alleles interact to produce traits, or the visible characteristics of an organism.

等位基因相互作用产生性状，或生物的可见征。

This differs from most genes in the genome, where both the maternal and paternal copies are expressed.

正常情况下，来自亲本两方的等位基因都会表达，而印记基因仅表达一方亲本来源的同源基因。

So some have two short alleles, some have two long ones, and the rest have one of each.

所以，有些人拥有两个短型等位基因，有些人拥有两个长型等位基因，剩下的则长型短型各一个。

This special genetic process is called imprinting, where only one copy of the gene gets expressed, not both.

这一殊的学过程称为“印记”，印记基因的存在使得两个等位基因中的一个表达而另一个不表达。

In these two genera, the alleles that allow the synthesis of muscarine, have been completely lost, or silenced.

在这两个类属中，允许合成毒蕈碱的等位基因已经完全丢失或静默。

The few remaining tomatoes just happen to have an allele frequency of 10% big C and 90% little c.

剩下的几个番茄恰好有 10% 的大 C 和 90% 的小 C 等位基因频率。

Having the G allele means you'll have a lower level of serotonin in your brain.

拥有G等位基因意味着你大脑中的血清素含量较低。

Sometimes mutations don't affect an organism, but sometimes they can result in brand-new alleles.

有时突变不会影响有机，但有时它们会产生全新的等位基因。

Notice the G allele may be the culprit here.

注意，G等位基因可能才是罪魁祸首。

That's the allele frequency of the tomato color gene in that population.

这就是这个群中番茄颜色基因的等位基因频率。

Evolution is simply the change in allele frequencies in a population over time.

进化只是一个种群中等位基因频率随时间而产生的变化。

A similar situation can happen with gene flow, when new alleles are introduced to a population through migration.

类似的情况也会发生在基因流动中——新的等位基因通过迁徙被引入到一个群之中。

Those seeds then start to grow, adding new alleles to our population's gene pool.

然后这些种子开始生长，为其种族基因库增加新的等位基因。

Just like humans, canines inherit one allele from each parent for a certain gene.

就像人类一样，犬类也会从每个父母那里继承一个等位基因。