跟读练习: Genetics Chapter 1 | Introduction to Genes, DNA, Mendel & Modern Genetics - 通过YouTube学习英语口语
C1
跟读控制
0% 已完成 (0/59 句)
Welcome to another lecture by Medical Medics, learning made easy.
⏸ 已暂停
速度:
重复次数:
等待模式:
字幕同步:0ms
所有句子
59 句
1
Welcome to another lecture by Medical Medics, learning made easy.
2
Genetics, Chapter 1, Introduction to Genetics.
3
In this lecture we will discuss what is genetics, briefly touch upon the history of genetics, the discovery of DNA, why genetics is important in medicine, some key concepts, and end with a summary.
4
Now, genetics is the science of heredity and variation in living organisms.
5
Focus areas include genes, which are the units of heredity, DNA, the blueprint of life, and chromosomes, these carry the genetic material.
6
Why is this relevant?
7
Because it explains biological diversity, and it links traits to their hereditary origins.
8
So an example of this is, why do some people have curly hair while others don't?
9
That's an example of genetics at work.
10
Now, before modern science, people thought that traits blended together like mixing colors.
11
But it wasn't until the discovery of cells where we got our first clues to start understanding heredity correctly.
12
correctly.
13
Because, for example, the blending inheritance theory couldn't explain trait reappearance.
14
And pangenesis was the idea that small particles from the body would transfer traits to our offspring.
15
And it implied that acquired traits could be inherited.
16
And this was later disproven.
17
Only after the discovery of cells, with the technological advancements of microscopy and when we get to Gregor Mendel,
18
who is called the father of genetics, did we start understanding heredity.
19
So, Gregor Mendel, called the father of genetics, what he did was he experimented with pea plants, and he observed patterns of inheritance in traits, for example, tall versus short plants.
20
And that led him to formulate two laws.
21
First, the law of segregation.
22
So, each parent passes one copy of a gene.
23
He also formulated the law of independent assortment, so traits are inherited independently.
24
So, for example, tall plants crossed with short plants produce tall offspring, but short plants can appear in the next generation.
25
So, following from Mendel's discoveries, we found that traits actually don't blend like they thought before.
26
Instead, they are passed down like in patterns, and it's like flipping a coin.
27
And then, of course, with the discovery of DNA, everything accelerated.
28
Now, Friedrich in 1869 discovered the nucleon, later known as DNA.
29
and he did that in white blood cells.
30
In 1952, the Hershey Chase experiment proved DNA, not proteins, is the genetic material using viruses and radioactive labeling.
31
Further on, 1953, Watson, Crick, and Franklin used x-ray diffraction to describe the DNA double helix structure.
32
And the structure of DNA, though, therefore, as we know it now, is a double helix, so a spiral staircase, and you can see it illustrated here.
33
And it is made of sugar, phosphate, and nitrogen bases.
34
And then you find A, T, C, G pairings, where you have adenine, thymine, cytosine, and guanine.
35
So DNA is like a twisted ladder made of molecules.
36
It carries the instructions for how your body grows and works.
37
And further, moving into modern genetics, we've had the Human Genome Project that went on from 1990 to 2003, where we mapped all human genes.
38
And this means that, similar to creating a GPS for the human body, it helps us to develop better treatments for diseases.
39
and of course it enabled breakthroughs in medicine and technology.
40
Some of these technologies could be CRISPR, which is a gene editing tool.
41
So an example is we use gene therapy for conditions like muscular dystrophy, where modern genetic tools are used.
42
And this gene therapy is becoming more and more and more popular now.
43
So why genetics is important in medicine?
44
Because first of all, diagnostics.
45
It helps us identifying genetic causes of diseases for example sickle cell anemia
46
personalized medicine so tailoring treatments based on dna for example
47
targeted cancer therapy preventive measures so predicting disease risk like brca mutations for breast cancer.
48
Now some key concepts in genetics include the gene, which is the unit of heredity, and it codes for proteins.
49
Then we have chromosomes, these structure organizing DNA in cells, and we have 23 pairs in humans, and in total, 46.
50
Mutations, so change in DNA sequence that can affect health.
51
An example is a mutation in the hemoglobin gene leading to sickle cell disease.
52
So a way to think about it is that genes are like instructions,
53
chromosomes are the books that hold these instructions, and mutations are typos in those instructions.
54
So in summary then, genetics studies how traits and diseases are inherited.
55
It's crucial in medicine, agriculture, and technology.
56
Historical milestones include Mendel's laws and the discovery of DNA.
57
And modern genetics drives personalized medicine and new treatments.
58
That's the end of the first chapter.
59
Continue now to chapter 2.
App Store 和 Google Play 评分 4.9/5
Shadowing English
移动端
随时随地使用 Shadowing English 应用学习英语。今天就提高您的沟通技巧！
跟踪您的学习进度
AI 评分和纠错
丰富的视频库
背景与背景
在本视频中，我们深入探讨了遗传学的基本概念，包括基因、DNA、孟德尔的研究以及现代遗传学的发展。遗传学是一门研究生物体遗传和变异的科学，重点关注基因、DNA及其在医药中的应用。这使得我们能够更好地理解生物多样性及特征如何与遗传起源相关联。通过这一讲座，学习者不仅可以掌握科学知识，还能通过光影训练技术提高英语发音，帮助理解讲述者所传达的内容。
日常交流的五个短语
- 基因（gene）：遗传的基本单位，决定生物的特征。
- 脱氧核糖核酸（DNA）：生命的蓝图，决定生物的结构和功能。
- 染色体（chromosome）：携带遗传物质的结构，人体有23对染色体。
- 突变（mutation）：DNA序列的变化，可能影响健康。
- 孟德尔定律（Mendel's laws）：遗传的规律，包括分离定律和独立分配定律。
逐步跟读指南
为了提高英语发音，建议您使用阴影技巧进行跟读练习。以下是具体步骤：
- 理解内容：首先观看视频并理解内容。在学习的同时注意讲述者的语速和语调。
- 分段练习：将视频内容分为几个小段，逐段重复。在每个段落后暂停，尝试复述刚刚听到的内容。
- 模仿语调：注意讲述者的语调变化，尝试模仿。这是提高英语发音的重要一步。
- 使用阴影技巧：在每段的后面立即开始跟读。这样可以提高你对句子的掌握和流利度，特别是在复杂的科学术语上。
- 不断重复：通过反复练习，强化记忆和发音。利用阴影发音训练，您会在日常交流中更加自信。
使用这一阴影发音技巧，能帮助您更好地掌握英语发音，提高与他人沟通的流利度，使英语学习更为高效。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。