Multiple Alleles, Sickle Cell Evolution, Pedigrees, & Sex Linkage
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Multiple Alleles, Sickle Cell Evolution, Pedigrees, & Sex Linkage

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Multiple Alleles, Sickle Cell Evolution, Pedigrees, & Sex Linkage Multiple Alleles, Sickle Cell Evolution, Pedigrees, & Sex Linkage Presentation Transcript

  • As a cell prepares to divide the DNA becomes condensed into compact structures called chromosomes (chromo = colored, somes = bodies) ‏ Offspring get DNA from parents by inheriting chromosomes!!!
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  • In humans, each body cell has 46 chromosomes in 2 sets (23 pairs) ‏ One set of chromosomes come from the mother and one set comes from the father
  • There can be more than two alleles for a gene! Human Blood Type has three alleles: A, B, and i AB are codominant, while i is recessive to both A and B Genotype Phenotype AA A Ai A BB B Bi B ii O AB AB More Complexity
  • Mutations: Sickle-Cell Anemia
  • If a mutation occurs in a sperm or egg, it may be transmitted to offspring If that mutation has a negative effect on the phenotype of an organism, the mutant condition is referred to as a genetic disorder (hereditary disease) ‏ BUT, not all mutations are harmful!!! Some mutations may make an individual better adapted to its environment, improving its chances for survival
  • Sickle Cell Anemia Blog Post
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  • How to Solve Pedigree Problems
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  • Sex-linkage – disorders or characteristics are found on the sex chromosomes