Friday, March 12, 2010
Fri-Day 2
Bio - we introduced the unit on sexual reproduction by discussing the evolutionary advantages and disadvantages of sexual reproduction.
We concluded that sexual reproduction is advantageous to a species that lives in a significantly changing environment because the variety within the population caused by sexual reproduction increases the likelihood that some members, due to their difference, will survive a generally harmful change in the environment and thus be alive to reproduce and pass on their traits that enabled them to survive in the new environment.
Asexually producing organisms have very little variety in the population so that an environmental change that harms some of the members of the population will likely negatively affect almost all of them, potentially causing extinction.
HOWEVER, sexual reproduction requires MUCH more energy in order for the sperm of the male partner to unite with the egg of the female partner- factors such as finding a mate, recognizing the mating behavior, producing specialized sex cells, etc. all require tremendous quantities of ATP. Asexual reproduction requires only one individual, no mates, no courtship behavior, much less ATP required.
AP Chem - we finished our problems on polyprotic acid equilibria and began to explain, in detail, the factors (bond strength and bond polarity) that affect acid strength. We determined relative strengths of acids H-X down a group and, from left to right, across a period.
We concluded that sexual reproduction is advantageous to a species that lives in a significantly changing environment because the variety within the population caused by sexual reproduction increases the likelihood that some members, due to their difference, will survive a generally harmful change in the environment and thus be alive to reproduce and pass on their traits that enabled them to survive in the new environment.
Asexually producing organisms have very little variety in the population so that an environmental change that harms some of the members of the population will likely negatively affect almost all of them, potentially causing extinction.
HOWEVER, sexual reproduction requires MUCH more energy in order for the sperm of the male partner to unite with the egg of the female partner- factors such as finding a mate, recognizing the mating behavior, producing specialized sex cells, etc. all require tremendous quantities of ATP. Asexual reproduction requires only one individual, no mates, no courtship behavior, much less ATP required.
AP Chem - we finished our problems on polyprotic acid equilibria and began to explain, in detail, the factors (bond strength and bond polarity) that affect acid strength. We determined relative strengths of acids H-X down a group and, from left to right, across a period.
# posted by C @ 10:40 PM 
