時(shí)差N小時(shí):在心里是雙胞胎

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唐：嗨，雅艾爾，你是雙胞胎嗎?

Yael: Nope.

雅艾爾：不是。

Don: Are you sure?

唐：你確定?

Yael:Unless there's something my parents haven'ttold me, yes, I'm sure. I'd know if I had a twinbrother or sister.

雅艾爾：除非我父母隱瞞了我一些事實(shí)，是的，我確定。如果我有雙胞胎兄弟姐妹的話，我應(yīng)該會(huì)知道。

Don: Perhaps, but even if you don't have a twin, you could still be a twin.

唐：也許，但是即使你沒有雙胞胎兄弟姐妹，你也可以是雙胞胎。

Yael:I don't get it.

雅艾爾：我不明白。

Don: You could be a chimera.

唐：你可以是凱米拉。

Yael: Oh, right. Actually, I still don't get it. A chimera is a mythological beast with the head ofa lion, the body of a goat, and the tail of a dragon, right?

雅艾爾：啊，對(duì)。事實(shí)上，我還是不懂。凱米拉是有著獅頭，羊身，龍尾巴的神話獸，對(duì)嗎?

Don: In mythology, yes, but in biology a chimera is an organism made up of two distinctgenetic lines.

唐：在神話中是這樣，但是在生物學(xué)上，它是由兩種不同基因序列構(gòu)成的生物。

Yael:But how is that possible?

雅艾爾：怎么可能?

Don: It's what happens when twin embryos fuse in the womb. The fusion results in what lookslike a single embryo, but the genetic material from each twin remains separate.

唐：子宮里的雙胞胎胚胎就是這樣融合的。胚胎融合后看起來只剩一個(gè)胚胎，但每個(gè)雙胞胎的遺傳物質(zhì)還是分開的。

Yael:So what does that mean? Does a chimera have one arm from one twin and the other armfrom the other twin?

雅艾爾：那么這意味著什么呢?是不是一個(gè)凱米拉的兩只胳膊分別來自兩個(gè)雙胞胎?

Don:Something like that. It's not like the arms would look different, exactly, or that the body'sorgans wouldn't be compatible or not work properly. But they do contain different anddistinct sets of chromosomes. So if you're a chimera, your liver could be composed of cellswith one set of chromosomes while your heart, say, consists of cells with an entirely differentset. Cool, huh?

唐：類似吧。實(shí)際上雙臂不會(huì)看起來不一樣，身體的器官也會(huì)互相兼容，且功能良好。但是他們包含的染色體確實(shí)不一樣。如果你是一個(gè)凱米拉，你的肝臟會(huì)由一套染色體控制合成的細(xì)胞組成，但你的心臟則是由另一套決然不同的染色體控制合成的細(xì)胞組成。很酷吧?

Yael:What happens when the embryos that fuse are of different sexes?

雅艾爾：如果融合的胚胎性別不同會(huì)怎么樣呢?

Don:Then the chimera could be a hermaphrodite.

唐：那么凱米拉就可能是陰陽人。

Yael:Well, I know I'm not a hermaphrodite.

雅艾爾：那我肯定不是陰陽人。

Don:But you could be your own twin.

唐：但你可能是自己的雙胞胎。