Hi. In this video, we're going to talk about alternative DNA forms. So, there are many different forms of DNA. The one we're most commonly familiar with is called bDNA, and this is that right-handed helix that we always see. It's the most common DNA form. This occurs in humans and other organisms. This is what we see, and this is, like, the real form of DNA. But in the laboratory setting and sometimes out in nature in sort of weird, unusual situations, you can see other forms of DNA, and so the 2 most common are A and zDNA. A is a shorter, right-handed helix, and Z is actually a left-handed helix. And so, there are also other forms here, C, D, E, P, V, and A, and there are others that I'm not even mentioning here. They all are different sizes and have different structures, usually formed in high salts or weird pHs or without lots of water, etcetera, etcetera. But just know that not all DNA looks like this. Some of it looks like the aDNA form, which is shorter, kind of crunched together, or the zDNA form, which is a left-handed helix. You can see it looks different. Right? This, if you know that bDNA is a right-handed helix, kinda does actually just look backward compared to this one which is still going the same direction but is just shorter. Right? This one, it's not really like bDNA. And so, these are the 3 main types of DNA, but just know that there are these other forms out there that can form in certain, really unusual conditions like high salt or pH. So with that, let's now move on.
Table of contents
- 1. Introduction to Genetics51m
- 2. Mendel's Laws of Inheritance3h 37m
- 3. Extensions to Mendelian Inheritance2h 41m
- 4. Genetic Mapping and Linkage2h 28m
- 5. Genetics of Bacteria and Viruses1h 21m
- 6. Chromosomal Variation1h 48m
- 7. DNA and Chromosome Structure56m
- 8. DNA Replication1h 10m
- 9. Mitosis and Meiosis1h 34m
- 10. Transcription1h 0m
- 11. Translation58m
- 12. Gene Regulation in Prokaryotes1h 19m
- 13. Gene Regulation in Eukaryotes44m
- 14. Genetic Control of Development44m
- 15. Genomes and Genomics1h 50m
- 16. Transposable Elements47m
- 17. Mutation, Repair, and Recombination1h 6m
- 18. Molecular Genetic Tools19m
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
7. DNA and Chromosome Structure
Alternative DNA Forms
Video duration:
1mPlay a video:
Related Videos
Related Practice
Alternative DNA Forms practice set
- Problem sets built by lead tutorsExpert video explanations