Thursday, March 25, 2010
Thurs-Day 1
Bio - performed a gamete formation/ meiosis simulation followed by simulated fertilization.
In this activity, we got to SEE and manipulate the real sources of variation that occur when sex cells are made and to SEE yet another source of variety in the "genetic recombination" that occurs during the fertilization of an egg cell via a sperm cell; we also kept track of the number of chromosomes, i.e. the half-haploid number of the (pair of each chromosome type) DIploid number.
We then simulated non-disjunction of a homologous pair during anaphase I and saw the effect on the gametes and potential embryos of having either ONE extra chromosome or ONE fewer chromosome - this leads to developmental problems e.g. mental retardation, organ malformation, etc.
I'll try to post even more practice quizzes later. STUDY FOR TOMORROW- then vacation!
AP Chem - we did a base-buffer problem in which we added a certain volume of strong acid and noted the changes. By now, you must immediately recognize ALL Bronsted acids and bases and know exactly how they react- one loses an H+, the other gains an H+. That's ALL that they do!
We then saw how to choose appropriate acids, bases, and salts to make a buffer of a designated pH.
In this activity, we got to SEE and manipulate the real sources of variation that occur when sex cells are made and to SEE yet another source of variety in the "genetic recombination" that occurs during the fertilization of an egg cell via a sperm cell; we also kept track of the number of chromosomes, i.e. the half-haploid number of the (pair of each chromosome type) DIploid number.
We then simulated non-disjunction of a homologous pair during anaphase I and saw the effect on the gametes and potential embryos of having either ONE extra chromosome or ONE fewer chromosome - this leads to developmental problems e.g. mental retardation, organ malformation, etc.
I'll try to post even more practice quizzes later. STUDY FOR TOMORROW- then vacation!
AP Chem - we did a base-buffer problem in which we added a certain volume of strong acid and noted the changes. By now, you must immediately recognize ALL Bronsted acids and bases and know exactly how they react- one loses an H+, the other gains an H+. That's ALL that they do!
We then saw how to choose appropriate acids, bases, and salts to make a buffer of a designated pH.
# posted by C @ 1:43 PM 
