Chromosome 15:

SexThis chapter introduces to us two different diseases: Prader-Willi and Angelman's syndrome. Both are gentic diseases and both are caused by the lack of chromosome 15. Inheriting these diseases depends on what parent carries the gene. Prader Willi comes from the father while Angelman's comes from the mother. This is linked to "sex" because it demonstrates the power of paternal genes. These diseases are inherited sexually and so therefor this chapter's name is sex. The mother and father have different controls over different inherited genes. This book tells us that the mother's genes have control over the cerebral cortex and the dad has control over the hypothalamus. According to this we know that we generally inherit our mom's way of thinking and our dad's moods.

chromosome 9

Disease
This chapter talks about the different blood types and each of their characteristics. They speak of O being the universal donor and who can donate to who. It also speaks of immunity and susceptibility to different diseases like cholera (A and AB) and malaria (O). The example used is sickle-cell disease vs. malaria. It is known that many of the African population carry either one or both genes for sickle-cell anemia because of the link to the allele’s resistance to malaria. Ridley explains that many alleles of these type of alleles are difficult to get rid of because some contribute to the resistance of more severe diseases. Basically this chapter says there is no stable changes. Genome will keep changing and evolutionizing.