Explaining the Human Female Karyotype
Karyotype is the technical term for the number of chromosomes: humans usually have 23 pairs, making 46 chromosomes in all. Some animals have more; some less.
For sex determination, the 23rd pair is the most important and strongly influences whether the individual is male (XY) or female (XX), although there are natural variations.
For sex determination, the 23rd pair is the most important and strongly influences whether the individual is male (XY) or female (XX), although there are natural variations.
Human Genetics 101
The basics of DNA and genetics
If you have found it hard to understand genetics and DNA in the past, it's worth going back to basics and starting with a primer. This animated video explains genetics in a simple, easy to understand way.
Human Karyotype Posters
The human karyotype makes an attractive poster, which is good for teaching children. A wide variety of colors and sizes are available, so if your preferred choice isn't shown here, please click through to Amazon to see more.
Chromosomes and Gender Testing
If by now you think it's easy to tell a man from a woman - look for a male Y chromosome - you'd be wrong. Nature tends not to follow textbooks and is often more complex in practice than any simple theory. That's certainly the case when it comes to testing gender, which is in fact rather difficult as the case of the South African athlete Caster Semenya shows.
About Kate Phizackerley
(Introducing your lensmistress)
If you have any extra information or questions about this lens you can contact Kate Phizackerley, the lensmistress, using the contact form I have provided.
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Kate has written many Squidoo lenses. Please visit her full lensography, sample Kate's top lenses, or read her Squidoo Diary to keep up to date with her recent publications.
And if you would like to know more about Kate then please visit her personal lens on Squidoo or Kate's main personal hub and web site. You may also enjoy her blogs News From the Valley of the Kings, Kate Phizackerley on Business" or PT Phiz.
Guestbook
I hope you like my lens but, whatever your opinions, I would like to hear your thoughts so please leave a message below. There's no need to be a member of Squidoo but no HTML is allowed.
I'd also really appreciate it if you would please go back to the top of my page and rate this lens. Just click home on the right. Thank you,
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boshemia
Sep 22, 2009 @ 10:35 pm | delete
- What a wide variety of interests you have, thanks for the informative lens and good luck with your quest for Giant!
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Finally, thank you to the developers whose icons I feature on my Squidoo lenses. Please refer to "Icons I Love" for full details and links to the developers' own sites. I also appreciate the section dividers collected by Stargazer00.
by Kate-Phizackerley
Off Squidoo I am a middle-aged woman with a wide range of interests from Ancient Egypt, backgammon, cookery ... to ... Zimbabwe which I visited 20 years... more »
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