小喜故事小屋 · DNA与遗传的秘密

DNA与遗传的秘密

The Secret of DNA and Heredity

阿鸦小喜

📜 文化小知识

小朋友有没有想过，为什么自己会长得像爸爸妈妈——比如爸爸的酒窝、妈妈的卷发？其实，在我们身体的每一个细胞里，都藏着一本极其微小的说明书，叫作DNA。这本说明书用最简单的密码，写下了造出一个人所需要的全部信息。

Have you ever wondered why you look like your mom and dad, maybe your dad's dimples or your mom's curly hair? Inside every single cell in your body, there is a tiny instruction manual called DNA. Written in the simplest of codes, this manual holds all the information needed to build a person.

DNA的形状十分特别，科学家把它比作一架拧成麻花状的软梯子，学名叫双螺旋。这架梯子上的每一级台阶，都由两个字母配对组成，一共只有四种字母，可是不同的排列顺序，却能写出地球上每一种生命独一无二的说明书。

DNA has a very special shape. Scientists describe it as a soft ladder twisted into a spiral, known as the double helix. Every rung of this ladder is made from a pair of letters, and although there are only four kinds of letters in total, their different ordering can write a one of a kind instruction manual for every living thing on Earth.

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🧬 每个人身体里都藏着一本独一无二的"说明书"——
它到底是怎么把"你"拼出来的？
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🧬 第68期：DNA与遗传的秘密

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小喜看到画里一条发光的双螺旋光带，悬浮在空中，好奇地问："阿鸦，这条闪闪发光的麻花是什么呀？"

Magpie saw a painting of a glowing double helix ribbon floating in the air, and asked curiously, "A-Ya, what is this shiny twisted ribbon?"

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阿鸦说："这不是普通的麻花，这是DNA，是藏在你身体每一个细胞里的说明书，写着造出你的全部秘密。"

A-Ya said, "This is not an ordinary twist, this is DNA, an instruction manual hidden inside every single cell in your body, containing all the secrets needed to build you."

小喜惊讶："说明书？它上面到底写了什么呀？"

Magpie was amazed, "An instruction manual? What exactly is written on it?"

阿鸦说："写着你眼睛是什么颜色、头发是直是卷、身高会长多高，这些统统都被记录在里面了。"

A-Ya said, "It records what color your eyes are, whether your hair is straight or curly, and how tall you will grow, all of it is written inside."

小喜追问："那为什么兄弟姐妹长得不一样呀？"

Magpie pressed on, "So why do brothers and sisters not look the same?"

阿鸦说："这里面藏着一个特别有趣的规律，一半来自爸爸，一半来自妈妈，组合的方式有无数种可能。"

A-Ya said, "There is a very interesting rule hidden inside, half comes from the father and half from the mother, and the ways they can combine are almost endless."

小喜好奇："那双胞胎呢？他们是不是组合方式一模一样呀？"

Magpie was curious, "What about twins, do they end up with exactly the same combination?"

阿鸦说："双胞胎的故事更有意思，还分成两种完全不同的情况，具体是怎么回事，还得从头讲起。"

A-Ya said, "The story of twins is even more interesting, and it splits into two completely different situations. Exactly how it works, we will have to start from the beginning."

🧬 阿鸦讲故事 · DNA与遗传的秘密

📍 场景：显微镜下的细胞世界

🐦

阿鸦，DNA到底长什么样子呀？

A-Ya, what does DNA actually look like?

🐦 小喜好奇地问……

🐦‍⬛

科学家把DNA的形状比作一条拧成麻花状的软梯子，专业名字叫双螺旋。这架梯子的每一级台阶，都是由两个小小的化学字母手拉手配对组成的，一共只有四种字母，科学家喜欢用A、T、C、G这四个字母来代表它们。奇妙的是，这四个字母只能按照固定的规则两两配对，一个字母永远只会跟另一个特定的字母手拉手，绝对不会配错对象。

Scientists describe the shape of DNA as a soft ladder twisted into a spiral, and its proper name is the double helix. Every rung of this ladder is formed by two tiny chemical letters holding hands in a pair, and there are only four kinds of letters in total, which scientists like to represent with the letters A, T, C, and G. What is remarkable is that these four letters can only pair up according to a fixed rule, one letter will always hold hands with one particular partner, and never with the wrong one.

📌 双螺旋 (shuāngluóxuán) = double helix

🐦

那这些字母是怎么决定我长什么样子的呀？

So how do these letters decide what I look like?

🐦 小喜好奇地问……

🐦‍⬛

这些字母连续排列成一段一段有意义的片段，每一段叫作一个基因，一个基因通常负责一个具体的任务，比如决定眼睛颜色的基因，或者决定卷发直发的基因。而所有的DNA，会紧紧缠绕，打包成一根根叫作染色体的长条，人体细胞里一共有二十三对染色体，其中一半来自爸爸，另一半来自妈妈。

These letters line up in a row to form meaningful segments, and each segment is called a gene, with each gene usually responsible for one specific task, such as the gene that decides eye color, or the gene that decides curly or straight hair. All of the DNA winds up tightly and packs into long strands called chromosomes, and there are twenty three pairs of chromosomes inside a human cell, half of which come from the father and the other half from the mother.

📌 基因 (jīyīn) = gene

🐦

那为什么兄弟姐妹拿到的字母不一样，会长得不一样呢？

So why do brothers and sisters end up looking different?

🐦 小喜忍不住问……

🐦‍⬛

因为爸爸妈妈各自的染色体在传给孩子之前，会先经历一次随机的洗牌和重新组合，就像洗一副扑克牌一样，每一次抽到的组合几乎都不会完全相同，所以除了同卵双胞胎之外，世界上几乎找不到两个基因组合完全一样的人。同卵双胞胎比较特别，他们是由同一颗受精卵分裂成两份长大的，所以两人的基因几乎一模一样；而异卵双胞胎，则是两颗不同的受精卵同时发育，基因跟普通兄弟姐妹差不多。

This is because before the chromosomes from the father and mother are passed on to a child, they first go through a random shuffle and recombination, much like shuffling a deck of cards, and almost every single draw ends up with a slightly different combination. Because of this, apart from identical twins, it is almost impossible to find two people in the world with exactly the same gene combination. Identical twins are special because they grow from a single fertilized egg that splits into two, so their genes are almost exactly the same, while fraternal twins develop from two separate fertilized eggs at the same time, and end up with genes about as similar as ordinary brothers and sisters.

📌 染色体 (rǎnsètǐ) = chromosome

🐦‍⬛ 阿鸦说

小喜感叹道："原来我们每个人都是一次独一无二的洗牌结果呀！"阿鸦点点头："是呀，这也是为什么世界上没有两个完全相同的人，每一个人都是独一无二的存在。"
Magpie sighed, "So each of us is the result of one unique shuffle!" A-Ya nodded, "That's right, this is exactly why there are no two completely identical people in the world, every single person is a one of a kind existence."

🎴 DNA词汇卡 · DNA and Heredity Word Cards

🧬

遗传

yíchuán

heredity

遗传决定了我们长得像谁。
Heredity decides who we resemble.

🧪

基因

jīyīn

gene

每个基因都负责一项特别的任务。
Each gene is responsible for one special task.

🔬

细胞

xìbāo

cell

DNA藏在身体的每一个细胞里。
DNA is hidden inside every cell in the body.

🧵

染色体

rǎnsètǐ

chromosome

人体细胞里一共有二十三对染色体。
There are twenty three pairs of chromosomes inside a human cell.

🔐

密码

mìmǎ

code

DNA用四个字母写成生命的密码。
DNA writes the code of life using four letters.

✨

特征

tèzhēng

trait

卷发和酒窝都是可以遗传的特征。
Curly hair and dimples are both traits that can be inherited.

👯

双胞胎

shuāngbāotāi

twins

同卵双胞胎的基因几乎一模一样。
Identical twins have genes that are almost exactly the same.

📘

说明书

shuōmíngshū

instruction manual

DNA就像造出一个人的说明书。
DNA is like an instruction manual for building a person.

🧬 小喜学到了 · Fun Facts

1953年，科学家沃森和克里克首次发现了DNA的双螺旋结构，这项发现后来被称为二十世纪最伟大的科学发现之一。如果把一个人身体里全部的DNA首尾相连拉直，长度加起来能来回地球和太阳之间跑上好几十趟，可它却能被紧紧折叠，塞进小小的细胞核里。🧬✨

In 1953, scientists Watson and Crick first discovered the double helix structure of DNA, a discovery later regarded as one of the greatest scientific achievements of the twentieth century. If all of the DNA inside one person's body were stretched out end to end, it would be long enough to travel back and forth between the Earth and the Sun dozens of times, yet it is folded up tightly enough to fit inside the tiny nucleus of a single cell.

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