Sex Determination | Biology for All | FuseSchool

Sex Determination | Biology for All | FuseSchool

Human body cells have 46 chromosomes arranged in 23 pairs. There are 22 pairs of autosomes and one pair of sex chromosomes (allosomes). For a male the sex chromosomes are usually XY whilst for a female they are XX. To make a baby, a sperm has to join with an ovum (or egg cell). You should know that they only have half of the DNA of a body cell; they are ‘haploid’. Instead of 46 chromosomes, so 23 pairs, they just have 23 chromosomes in total. 22 autosomes and one sex chromosome, or allosome. An ovum will always have an X chromosome but the sperm will have an X or a Y. If we looked at this in a punnett square, the gametes from the female would always be X. So X, X. And the gametes from the male would be either X or Y. So really, it is the man who determines the gender of the child. He brings the Y which is the only chance of a male childUnfortunately for Anne Boleyn, a wife of King Henry 8th of England in the 16th century, she was executed for not providing a male heir to the throne when really his sperm were to blame! From the punnett square, we would expect 50% of the offspring to be male and 50% to be female. But the actual outcomes may be different. One couple could for example end up with 4 girls. Discounting social factors such as sex-selective abortions, at birth the natural male-to-female sex ratio for humans is about 105 males to 100 females. It is thought that this is nature’s way of overcoming the fact that males have a higher risk of dying younger than females. The overall world male-to-female sex ratio drops down to 101 males to every 100 females, so is closer to the expected 50% of each. Most tortoiseshell cats are female because this fur colour is a characteristic found on the X chromosome. But males have one X chromosome, so why can’t males be tortoiseshell? For a tortoiseshell cat, two X chromosomes are needed to show the three different colours. So as females have XX sex-chromosomes, they can be tortoiseshell. But XY males can’t. Now I say ‘most’ rather than all because you can occasionally get a male tortoiseshell cat, just like you can occasionally get a human man with XX chromosomes. These rare individuals have an extra strand of DNA, and so are XXY (rather than just XY). So the male has the double X’s needed to be tortoiseshell. There are other rare chromosomal disorders that mean you can have XX human males and XY females. Or Turner syndrome when only one sex chromosome is present, a solitary X. XYY and XXYY are two more syndromes, and there are many others. From this video you should now know that females usually have XX sex-chromosomes, and males usually have XY. The father provides the Y-chromosome, and so the chance of having a male child falls on his shoulders. SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Find all of our Chemistry videos here: https://www.youtube.com/watch?v=cRnpKjHpFyg&list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV Find all of our Biology videos here: https://www.youtube.com/watch?v=tjkHzEVcyrE&list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0 Find all of our Maths videos here: https://www.youtube.com/watch?v=hJq_cdz_L00&list=PLW0gavSzhMlTyWKCgW1616v3fIywogoZQ Twitter: https://twitter.com/fuseSchool Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Follow us: http://www.youtube.com/fuseschool Friend us: http://www.facebook.com/fuseschool This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org

Human Reproduction - मनुष्यो में लिंग निर्धारण - Gender determination - in Hindi

Human Reproduction - मनुष्यो में लिंग निर्धारण  - Gender determination - in Hindi

The video explain about XX and XY chromosome which determines the gender and effect of hormones in determining gender. Best free animated CBSE lessons to make your score better: https://www.facebook.com/learninghub.academy/ The video mapped to CBSE board curriculum. Knowledge can enlighten the minds, so we worship knowledge. Follow us on twitter to latest video release on CBSE board and education: https://twitter.com/Toknowhub

How Sex Genes Are More Complicated Than You Thought

How Sex Genes Are More Complicated Than You Thought

XX and XY are the chromosome pairs that determine your sex but what happens when you’re born with XXX or XYY? How often does this happen? Check out Wise Crack for more cool videos like this one: Is Gender Real? https://www.youtube.com/watch?v=gkilQ87UUj8 Read More: Human Sex Chromosomes Are Sloppy DNA Swappers http://www.smithsonianmag.com/science-nature/human-sex-chromosomes-are-sloppy-dna-swappers-180955946/?no-ist “The genetic bundles that code for males and females can get a little messy when they trade pieces during cell division” Evolution of the Y Chromosome http://www.hhmi.org/biointeractive/evolution-y-chromosome “The human X and Y chromosomes are a unique pair. The other chromosome pairs, called the autosomes, appear to be identical twins; they are superficially indistinguishable. In contrast, the X and Y chromosomes appear to be vastly different from one another.” ____________________ DNews is dedicated to satisfying your curiosity and to bringing you mind-bending stories & perspectives you won't find anywhere else! New videos twice daily. Watch More DNews on TestTube http://testtube.com/dnews Subscribe now! http://www.youtube.com/subscription_center?add_user=dnewschannel DNews on Twitter http://twitter.com/dnews Trace Dominguez on Twitter https://twitter.com/tracedominguez Julia Wilde on Twitter https://twitter.com/julia_sci DNews on Facebook https://facebook.com/DiscoveryNews DNews on Google+ http://gplus.to/dnews Discovery News http://discoverynews.com Download the TestTube App: http://testu.be/1ndmmMq

Sex Determination: More Complicated Than You Thought

Sex Determination: More Complicated Than You Thought

From something as small and complex as a chromosome to something as seemingly simple as the weather, sex determination systems vary significantly across the animal kingdom. Biologist and teacher Aaron Reedy shows us the amazing differences between species when it comes to determination of gender. Lesson by Aaron Reedy, animation by BuzzCo (http://buzzzco.com).

GENETICS 1: SEX LINKAGE: XY CHROMOSOMES AND GENDER

GENETICS 1: SEX LINKAGE: XY CHROMOSOMES AND GENDER

XY CHROMOSOMES AND GENDER

Genetics - Sex Determination

Genetics - Sex Determination

Sex in organisms is determined by sex chromosomes or environmental factors. To help students search for a topic easily, all the channel videos have been archived chapter wise on www.onlinenbt.com The study notes are available on Amazon India. The related affiliate links are provided below Reproduction - https://amzn.to/2wu43eS Human Physiology - http://amzn.to/2DA46ea Plant Physiology - http://amzn.to/2EZR5HS Biotechnology - http://amzn.to/2EZyqf9 Free Delivery (On Selected Pin codes) !!!, Cash on Delivery Available!!! Follow us on Twitter to get your doubts/questions solved and be updated on NOTES!!! https://twitter.com/neelabakore

Punnett Squares and Sex-Linked Traits

Punnett Squares and Sex-Linked Traits

Explore inheritance when carried on the X chromosome with the Amoeba Sisters! This video has a handout here: http://www.amoebasisters.com/handouts.html This video focuses on how to do general Punnett square problems that involve traits on the sex chromosomes (X and Y chromosomes). We do want to point out though that when it comes to biological sex- it can be influenced by more than just sex chromosomes X and Y. For example, the SRY gene, plays a major role in human biological sex determination. While this video only focuses on solving sex-linked trait problems in a Punnett square, here are some further reading suggestions to learn about the SRY gene and its role in biological sex. Further Reading Suggestions: (Updated 2018)********** About SRY Gene from NIH: https://ghr.nlm.nih.gov/gene/SRY About SRY and Sex Determination from Harvard: http://sitn.hms.harvard.edu/flash/2016/im-xy-know-sex-determination-systems-101/ *************************************************************** Support us on Patreon! http://www.patreon.com/amoebasisters Our FREE resources: GIFs: http://www.amoebasisters.com/gifs.html Handouts: http://www.amoebasisters.com/handouts.html Comics: http://www.amoebasisters.com/parameciumparlorcomics Connect with us! Website: http://www.AmoebaSisters.com Twitter: http://www.twitter.com/AmoebaSisters Facebook: http://www.facebook.com/AmoebaSisters Tumblr: http://www.amoebasisters.tumblr.com Pinterest: http://www.pinterest.com/AmoebaSister­s Instagram: https://www.instagram.com/amoebasistersofficial/ Visit our Redbubble store at http://www.amoebasisters.com/store.html The Amoeba Sisters videos demystify science with humor and relevance. The videos center on Pinky's certification and experience in teaching science at the high school level. Pinky's teacher certification is in grades 4-8 science and 8-12 composite science (encompassing biology, chemistry, and physics). Amoeba Sisters videos only cover concepts that Pinky is certified to teach, and they focus on her specialty: secondary life science. For more information about The Amoeba Sisters, visit: http://www.amoebasisters.com/about-us.html We cover the basics in biology concepts at the secondary level. If you are looking to discover more about biology and go into depth beyond these basics, our recommended reference is the FREE, peer reviewed, open source OpenStax biology textbook: https://openstax.org/details/books/biology We take pride in our AWESOME community, and we welcome feedback and discussion. However, please remember that this is an education channel. See YouTube's community guidelines https://www.youtube.com/yt/policyandsafety/communityguidelines.html and YouTube's policy center https://support.google.com/youtube/topic/2676378?hl=en&ref_topic=6151248. We also reserve the right to remove comments with vulgar language. Music is this video is listed free to use/no attribution required from the YouTube audio library https://www.youtube.com/audiolibrary/music?feature=blog We have YouTube's community contributed subtitles feature on to allow translations for different languages. YouTube automatically credits the different language contributors below (unless the contributor had opted out of being credited). We are thankful for those that contribute different languages. If you have a concern about community contributed contributions, please contact us.

Secrets of the X chromosome - Robin Ball

Secrets of the X chromosome - Robin Ball

View full lesson: http://ed.ted.com/lessons/secrets-of-the-x-chromosome-robin-ball The sequence of DNA that we inherit from our parents encodes directions for making our cells and giving us specific traits. Identical twins have the same DNA sequence, so how can one twin end up with a genetic disorder while the other twin does not? Robin Ball explains how the secret lies in X chromosome inactivation. Lesson by Robin Ball, animation by Anton Trofimov.

XY & Z - Pokémon XYZ (FULL ENGLISH COVER)

XY & Z - Pokémon XYZ (FULL ENGLISH COVER)

Soundcloud: http://bit.ly/xyzfulljorporxx My full cover of 'XY&Z', Pocket Monsters XY&Z's first opening song. Originally sung by the amazing Rica Matsumoto. You guys asked for it, a lot, so here it is! The full version of XY&Z! Thank you all so much for the amazing support lately, it means a lot to me! Singing and translating this one was a blast! The song always got me so hyped while working on it! Most fun I've ever had with a cover for sure! Translating went pretty smoothly. Like with the first version, I got some inspiration from Nagi-chan's cover (you should check it out, link down below!) and my friend Roy, who came up with some fantastic sentences (you need to do this more often, Roy!). This cover wouldn't have been the same without either of them. By the way, can we talk about how freaking amazing the Pocket Monsters anime has been lately?! I mean, that Ash vs Diantha fight gave me chills! If you gave up on the Pokémon anime, you should start again! XYZ has been the bomb! I hope you enjoyed this cover and I hope to see you again next time! Lyrics: Hey! Just like the morning sun that’s shining brightly over Kalos (Our burning hearts are hotter than a Flame Charge) Yeah! We're all prepared and so you'll never see us run from chaos (Breaking the mold will let our passion Discharge) All of our feelings overlap, yeah we are always synchronized Cause we have formed a bond that will never dissappear And I know that I will never shed a tear As long as you're here (wowowoyeahyeah) So let'Z go! We’re growing as the battle’s raging on And you know! That defeat’s an opportunity To grow! We're never giving up Our determination is what makes us strong Yeah determination is what makes us strong Hey! There will be times where we'll be forced to Blaze through our opponents (If there's a roadblock stopping us, we'll tear it down!) Look! The Victory Star is right ahead so take a sprint and grab it (Our Steadfast hearts will lead us to our glory now!) Sometimes I wonder how much time there's left where we're a unity And the fear of being alone may sometimes knock me down But I get the strength to get back up again When you reach for my hand Now let'Z go! Strong rivals will be waiting up ahead And we'll show! We can knock them down with just one hit So I know! There's no way I can lose Cause my heart and dreams are always here with me And I know that you will always be with me, yeah! Let'Z go! If there's a fight that we can't seem to win Yeah let'Z go! I know that you will be there for me So let'z go! You'll always have my back With our strength combined we'll deal the last attack So let'Z go! We’re growing as the battle’s raging on And you know! That defeat’s an opportunity To grow! We're never giving up Our determination is what makes us strong Now let'Z go! We will fulfill this dream with all we have So let'Z go! And we’ll prove that we can catch them all! Let'Z go! Keep fighting with your heart And you're certain that your future will be bright When you see yourself transcend to unknown heights, yeah! So! Let'Z turn it up now (Shock them like a Thunderbolt) Go! Keep standing tall and if we’re fighting as a team, stronger than a Hyper Beam, we will be surpassing our dreams! _______________________________________________________________ Nagi-chan's channel: https://www.youtube.com/channel/UCkhXK6Uq_89f6M5iksOyCGA Roy's channel: https://www.youtube.com/user/KilleRoyNl My Facebook page: http://www.facebook.com/jorporxx My Soundcloud: https://soundcloud.com/jorporx Ask me stuff: http://ask.fm/JorporXx

EC50 and IC50 Determination in Excel

EC50 and IC50 Determination in Excel

How do I calculate in Excel the concentration of a drug that gives half-maximal response? What is the equation to plot a dose-response curve - either for an increased response (EC50) or an inhibitory response (IC50).

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