This week in bio we focused on modes of inheritance. The biggest part of the week was our virtual fruit fly lab. Here we were tasked with crossing specific traits from fruit flies and from the resulting phenotypes of offspring from first and second generations, we were to predict the genotype of the parents and the inheritance pattern of the traits. We would test our hypothesized inheritance pattern by entering the expected values as predicted by the ratios given by the inheritance pattern, into a chi-square analysis. The first two crosses of fruit flies went swimmingly and I was easily able to predict the inheritance pattern. But the third and fourth crosses gave me particular trouble. The root of the problem for cross three was because when I got home I accidentally gave the wrong gender the trait of white eyes. This trait was supposed to be sex linked and giving it to the wrong sex altered the outcomes from what was originally intended. The fourth cross was one of our own design and after dealing trying fruitlessly to solve what I had done wrong in the third cross, my patience was thin come the dihybrid of the fourth cross and I was unable to accurately predict the inheritance pattern. When I am given known genotypes it is easy for me to predict the probability of certain outcomes, but it is harder for me to work backwards and determine inheritance patterns because there ares so many patterns from, autosomal dominant, recessive, sex linked, co-dominance, incomplete dominance, or perhaps the homozygous dominant or other genotype is fatal. I will need more practice to get it all down,
This week we also completed the Vodcasts on Mendelian extensions in which we learned some of the other modes of inheritance that go beyond the simple Dominant/recessive relationship. We also learned of some specific human conditions and how they are inherited like hemophilia and cystic fibrosis. Thursday we worked on more Mendelian genetics problems and practiced some grid in questions that would appear on the AP exam. Friday we worked on multiple choice questions from an actual AP Exam of a couple years ago in spirit of the up coming exam now only 37 days hence.