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Juliana Agostino
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Hi all..does anyone here have a good example of a year 1 science assessment for criterion A or D?

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This research is revolutionizing the way we think about reproduction and the Y chromosome. 

Is the Y chromosome necessary? Recent studies suggest that the answer is 'sort of'. Last year a study came out showing that, contrary to much belief, the Y chromosome isn't losing genes over the course of human evolution (it's lost only one gene in 25 millions years). However, this week a study published in Science shows that only 2 genes from the Y chromosome - Sry and Eif2s3y - are necessary to produce healthy offspring in mice.
 
This line of research has all kinds of implications for what it means to be sterile and have a dysfunctional Y chromosome. However, we need more research to understand why the Y chromosome has been so conserved, while only a few parts of it are needed for 'maleness'. 

Sources:
http://www.nature.com/news/mice-with-just-two-male-genes-father-babies-1.14219
http://www.sciencemag.org/content/early/2013/11/20/science.1242544
http://www.nature.com/nature/journal/v483/n7387/full/nature10843.html

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Scientific #inquiry unit for MYP year two students - The Scientist Within Me!  

Hi fellow MYP teachers! I have a pedagogical question for anyone who teaches MYP science.  Have you ever given a "lab test" to assess for criterion D/E/F or possibly C? What I mean is a "test" in which the students are given a problem and materials and have to spend the period writing a procedure, collecting data, making a graph and writing a conclusion alone in silence? I'm not sure how I feel about this as an authentic assessment. Thoughts???

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test

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oooh fascinating stuff! #IBBio  Topic 4 #genetics  
Do you carry different genomes at different parts of your body?

It turns out the dogma by which every person had only one genome present in every cell of the body is questioned more and more every time.

What seemed to be a rare exception is more common than previously thought. Diverse mechanisms could explain how two genomes mix and develop to a healthy adult, which might discover it only by chance: for instance by finding that she has two different types of blood cells; or experiencing skin discolorations only on clearly delimited parts of his body.

This poses a lot of interesting questions, from medical treatments to forensics. But to me the most exciting part comes when it explains that it is common for moms to have neurons in their brains containing Y chromosomes, which indicates that cells from their sons travelled all the way there and established as functional part of their brains.

This is very romantic! I love to think that my wife might have 50% of my genes in some of the cells she uses to think of me every day. Cute!

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Useful for #IBBio  topic 3!
Almost 99% of the mass of the human body is made up of the six elements oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All are necessary to life. The remaining elements are trace elements, of which more than a dozen are thought to be necessary for life, or play a role in good health (e.g., fluorine, which hardens dental enamel but seems to have no other function).

http://en.wikipedia.org/wiki/Composition_of_the_human_body

http://physicscentral.com/explore/poster-stardust.cfm
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