WARM UP 3/13 Take the KWL on twins, do the K and W K - What do you know about twins? W - What do you...
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Transcript of WARM UP 3/13 Take the KWL on twins, do the K and W K - What do you know about twins? W - What do you...
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WARM UP 3/13Take the KWL on twins, do the K and W
K - What do you know about twins?
W - What do you want to know about twins? ( at least 2)
L - What have you learned today about twins (3 things!)
This needs to be done and turned in the tray at the end of the hour
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TODAY 3/13
1) Notes on twins2) Article on “nature vs nurture” with questions3) Finish notes????4) Turn in KWL
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CH 13 NOTES #23/13
Twins
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TYPES OF TWINS
1. IDENTICAL (monozygotic)
* 1 egg, 1 sperm * same DNA * zygote splits and develops into 2 babies (or more) * look the same, same gender
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2. FRATERNAL (dizygotic) * 2 eggs, 2 sperm (or more) * can be same gender or different * do not look identical
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Which is which?
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Think and share with someone next to you
Could you have triplet identical? How?
How could you have 4 fraternal? What happens?
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IN VIRTO * eggs taken out,
sperm added, egg placed back in mother
* to assure implanting, they put in several fertilized eggs.
* often leads to multiple births
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FUN FACTS
Most every children to one woman: ? 69 16 twins, 7 triplets, 4 quadruplets
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Largest number of “twins” =
• Two offspring – twins• Three offspring – triplets• Four offspring – quadruplets• Five offspring – quintuplets• Six offspring – sextuplets• Seven offspring – septuplets• Eight offspring – octuplets• Nine offspring – nonuplets• Ten offspring – dectuplets
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What 2 things does this show
you?
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Black and white twins• “It wouldn’t really be possible for a black
African father and a white mother to have a white child, because the African would carry only black skin gene variants in his DNA, so wouldn’t have any European DNA, with white skin variants, to pass on,” he explains.
• People of Caribbean descent are often likely to carry European DNA. Which, if you can remember back to your high school biology unit on genetics, is enough to create a striking difference.
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• Heteropaternal Superfecundation • Is the term used when a woman becomes
pregnant from two different man and gives birth to fraternal twins.
• Elvis Presley had a twin who did not survive after birth. His name was Jesse Garon!
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NATURE VS. NURTURE and TWIN STUDIES:
• Reading • Questions
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What is this graph showing you?
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• If you have two identical twins living in the same house, raised by the same parents, do you think they will always turn out the same?
1 hand up = YES 2 hands up = NO
• What are some things that one twin could do that they other one didn’t that could make them look different, be different health, or act different?
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Fraternal twins (girls) have twice the chance of giving birth to twins
1 in 250 pregnancies can result in identical twins
In some African countries such as Nigeria, the rate of twin pregnancies can be as high as 1 in 20
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YOUR DO NOW 3/14
Take out your Ch 13 notes #2 on twins from yesterday.
On the spot about “Nature vs. Nurture and Twin Studies” write what you learned yesterday about this.
(may talk to a person around you to help)
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TODAY 3/14
1) Finish notes on last twin type2) Vocab term cards for review
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3. CONJOINED * 1 egg, 1 sperm (so identical) * zygote only partially separates * bodies are joined somewhere - share organs/ hard to separate
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• Science of conjoined twins
• Abby and Brittany
• Ronnie and Donnie
• Spider Girls