DNA, CHROMOSOMES, GENES & ALLELES. GCSE Science Biology

www.sciencetutorial4u.com This video covers DNA and chromosomes for students studying for GCSE Science Biology.
Refer to these timings to cover:
1. From nucleus to DNA 0:30
2. Structure of DNA 1:42
3. What is a gene? 2:28
4. What is an allele? 3:24
5. 46 Chromosomes 3:49
6. Animals have different
number of chromosomes 5:49
Please like, subscribe and share, THANK YOU so much:
• DNA, CHROMOSOMES, GENE...
1. From nucleus to DNA 0:30
If you zoom into the nucleus, you will observe a compact structure called a chromosomes and a smaller section of chromosome will lead to genes. Further zooming into gene will lead to DNA which stand for deoxyribonucleic acid.
2. Structure of DNA 1:42
DNA contains information of inheritance. This is achieved by having different base sequence. The DNA is said to have double helix or it can be described as a twisted ladder.
3. What is a gene? 2:28
Genes provide specific characteristics such as eye colour, skin colour and height. Genes can be described as a group of DNA or it can be also described as a small section of chromosome.
4. What is an allele? 3:24
Alleles are different version of the same gene.
5. 46 Chromosomes 3:49
The human body cells contain 46 chromosomes, or it can be called as 23 pairs of chromosome. Gametes which are sex cells ( sperm and egg ) contain half the number of body cells which is 23 chromosomes only. Girls have XX chromosomes and boys have XY chromosomes.
6. Animals have different number of chromosomes 5:49
Different species have different number of chromosomes. For example, cats contain 39 chromosomes which means their gametes will have 19 chromosomes in their cells. To find the number of chromosomes in gametes, you just have to dive it by 2 or just half it.
MUSICS:
"Son of a Rocket" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b...
"Cut and Run" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b...

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Chromosomes, DNA, Genes - Thank you! it's been puzzled me for so long, now I understand it from a popular science point of view.

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[@mayas3804]

I understood this so well! This is prob the best way to learn anything! I love things broken downs into detail. I wish everyone taught this way!

[@jutankarmakar2860]

thanks for your good explained.. group of DNA is called gene -is if right..I know segment of DNA which can able to protein synthesis is called gene..

[@loicpale5136]

Very good and helpful.
You've explained everything clearly and simply as it could be.
Thanks so much!

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All of my doubts cleared in just one video !
Thank-you

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Thank you. U just explained 9 lessons in science

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+Darcy Holland Thanks a lot for the comment. Keep up the good work and good luck :)

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I m so confused in this topic but after watching your video all my doubts are clear

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This is really very helpful to clear my basics..thanks a lot!

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This tutorial was so good it cleared up all my confusion. Thanks a lot :) I will recommend this to all my friends.

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+Anni3 _ Thank you :)

[@chill4782]

Wow sir amazing explanation, my confusion between chromosome gene and allele is clear now , thank you so much sir 😁😁😁

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An amazing video explaining all the basics so easily and properly. Thanks a lot!!

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TQ for your simply explained sir and can make the video of protein synthesis like this simple method sir

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+Inrico Orbe Thank you for the comment. Happy to help :)

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TX. It made sense to me.I finally understand it.

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+Melissa Graziani Thank you :)

[@cholletishashidhar1451]

thank u so much sir, your video have helped me a lot of and vanished all my doubt also, but a small doubt
what is the function of chromosomes in our body

[@mohammedhanif8080]

Thanks I have got a good understanding now of what a chromosome is

[@wiir8]

Very helpful! thank you

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thanks ..very helpful

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great video, it helps a lot

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Wonderful explanation!
I am going through your biology videos to get ready from my mock exam on the 17.1.17
Thank you.

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He Chriszy what about your test score ? Forgot

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[@helenball4225]

I like most of the information on this clip as it is easy to follow. However, it might be useful to use another example for alleles instead of blue and brown eyes. Eye colour is a polygenic trait and is not controlled by one genes. something like tongue rolling might have been better. But as I said at the start the sequence of information is well done.

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Thank you u r very good teacher

[@ABDALLAHKIWAN]

Thank you very much sir...

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This was actually helpful, I'm surprised! I have an exam on Monday wish me luck!

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[@sciencetutorial4u]

Hi Kieran. Thanks for the comment. I have already recorded couple of unit 2 topics so now I am editing them. I will definitely upload important unit 3 topics before exam.

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Thankyou please do for selective breeding

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Happy to help :)

[@madhumota6469]

Sir i hv read yht gene is a small stretch of Dna controlling particular trait .... but u hv showed tht gene contain Dna....
plz clear my doubt by answering this Q how genes & chromosome hv similar behaviour??? Plllzzz ans SIR

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a really good video covers some main areas, however, it doesn't cover all, for example haploid, diploid

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Thank you. Sure, I'll upload more video :)