Biology 1001A Lecture Notes - Lecture 11: Zygosity, Product Rule, Probability Distribution
21 Nov 2012
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Document Summary
Genes for making parts speci c to one sex do not have to be located on a sex chromosome. People used to believe that inheritance was a blending process. It was thought that the traits expressed by offspring would be an intermediate of the two parents. Mendel changed the way that people think about inheritance. Ex: a blue parent and red parent would have a purple child, wrong. The problem was that two medium height people could have a child taller than either of them, hence the blending hypothesis was clearly wrong. Polygenic traits shown continuous variation in a population. Dominant alleles make your skin darker, recessive alleles make your skin lighter. Mayonnaise people have no dominant allele, whereas coal people have 6 dominant alleles. Cinnamon people can have either mayonnaise or coal children. The cinnamon people are not a blend, they are a combination of alleles.
