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Chapter%2015%20Outline - CHAPTER15OUTLINE Genes Fig15.1

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CHAPTER 15 OUTLINE Genes Are located on chromosomes Can be visualized using certain techniques Fig 15.1 Chromosome Theory Of Inheritance The chromosome theory of inheritance states that Mendelian genes have specific loci on chromosomes Chromosomes undergo segregation and independent assortment The Chromosomal Basis Of Mendel’s Laws Fig 15.2 Morgan Hunt’s Experiments Morgan worked with fruit flies Because they breed at a high rate  A new generation can be bred every two weeks They have only four pairs of chromosomes Morgan first observed and noted Wild type, or normal, phenotypes that were common in the fly populations Traits alternative to the wild type Are called mutant phenotypes Fig 15.3 Correlating Behavior of a Gene’s Alleles with Behavior of a Chromosome Pair In one experiment Morgan mated male flies with white eyes (mutant) with female  flies with red eyes (wild type) The F 1  generation all had red eyes The F 2  generation showed the 3:1 red:white eye ratio, but only males had  white eyes Morgan determined  That the white-eye mutant allele must be located on the X chromosome Fig 15.4
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Linked Genes Linked genes  inherited together because they are located near each other on the same  chromosome Each chromosome
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