Friday, March 19, 2010
Fri-Day 1
Bio - Our unit exam on sexual reproduction, meiosis, and growth/development is on next FRIDAY, March 26th. The unit hw is due on WEDNESDAY, March 24th.
We had a presentation on Science Research, a great class in which you apply and practice scientific reasoning.
We began the other main part of our unit: how sex cells/gametes are made via meiosis and the two CAUSES of variety among gametes. We saw how, during late prophase, synapsis occurs that allows certain segments of homologous chromosome pairs to CROSS-OVER each other, thus exchanging DNA segments (containing genes) between each other. We also saw that homologous chromosome pairs line up/assort INDEPENDENTLY of each other, allowing for trillions and trillions of different possible left and right side line-ups of the chromosome pairs, causing trillions and trillions of different combinations of traits from a given parent.
AP Chem - showed FOUR ways to make a buffer solution and explained how and why these solutions are "cushioned"/buffered against drastic changes in pH (hydronum or hydroxide concentation changes).
We also did a complex equilibria calculation in which we determined the pH of a buffer solution.
We had a presentation on Science Research, a great class in which you apply and practice scientific reasoning.
We began the other main part of our unit: how sex cells/gametes are made via meiosis and the two CAUSES of variety among gametes. We saw how, during late prophase, synapsis occurs that allows certain segments of homologous chromosome pairs to CROSS-OVER each other, thus exchanging DNA segments (containing genes) between each other. We also saw that homologous chromosome pairs line up/assort INDEPENDENTLY of each other, allowing for trillions and trillions of different possible left and right side line-ups of the chromosome pairs, causing trillions and trillions of different combinations of traits from a given parent.
AP Chem - showed FOUR ways to make a buffer solution and explained how and why these solutions are "cushioned"/buffered against drastic changes in pH (hydronum or hydroxide concentation changes).
We also did a complex equilibria calculation in which we determined the pH of a buffer solution.
# posted by C @ 12:27 PM 
