Sunday, August 7, 2011

How to RECOGNIZE what kind of genetic cross is involved?

Usually when you are reading this kind of questions they will give you the alleles involved and that will be your first clue, also you can see how many characteristics of the organism to be cross are they describing to you (very important). For example a mono-hybrid cross will be between genes with the following alleles Tt*tt, which will display only one characteristic of the organism (example size) and a dihybrid cross will display more than one characteristic of the organism example TYTY*tyty size and color. For co-dominance there are usually clic examples such as blood groups, but it depends on the text if two characteristics are both expressed with the same penetrance then it will probably be codominance. The same thing happens complete and incomplete dominance you will see that the phenotype of the offspring will combined instead of recessive and dominant. One clic example of this is will be a pink flower daughter of red and white parents. linked characteristics are literally related to the genes they will talk about the disease that the mother or the father will carrie, you are suppose to know the clic examples which are hemophilia and color-blindness which are x-linked as well as baldness. Then the daughters of persons with these kind of diseases will almost never express the disease but they will be carriers of the gene.

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