Bio111 - A pair of homologous chromosomes, each in the...

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1 Fig. 8.1 A pair of homologous chromosomes , each in the unduplicated state (most often, one from a male parent and its partner from a female parent) A gene locus (plural, loci), the location for a specific gene on a specific type of chromosome A pair of alleles (each being a certain molecular form of a gene) at corresponding loci on a pair of homologous chromosomes Three pairs of genes (at three loci on this pair of homologous chromosomes); same thing as three pairs of alleles Chromosomes and Inheritance Genes A A A A a a a a meiosis I A A A A a a a a meiosis II gametes A A A A A a a a a a a (chromosomes duplicated before meiosis) Homozygous dominant parent Homozygous recessive parent A Fig. 8.4 Meiosis and Segregation of Alleles Fig. 8.3 Garden pea Mendel Patterns of Inheritance true-breeding hybrid P F 1 Trait Studied Dominant Form Recessive Form FLOWER COLOR FLOWER POSITION STEM LENGTH tall dwarf along stem at tip purple white Fig. 8.5 Mendel’s Results F 1 s all one phenotype for each trait purple x white along stem x at tip tall x dwarf (actually 7 traits studied)
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2 Mendel’s Experiments Is recessive “allele” (for white flowers) still there in F 1 ? Can it be passed on even though not seen? Monohybrid Cross P: purple x white F 1 : all purple self-fertilize ???? Trait Studied Dominant Form Recessive Form F 2 Dominant-to- Recessive Ratio FLOWER COLOR FLOWER POSITION STEM LENGTH 3.15:1 3.14:1 2.84:1 787 tall 277 dwarf 651 along stem 207 at tip 705 purple 224 white Average ratio for all traits studied: Fig. 8.5 p.115 Possible Conclusion 2 “alleles” govern each
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This note was uploaded on 01/05/2009 for the course BIO 111 taught by Professor Goschke during the Spring '07 term at Cal Poly.

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Bio111 - A pair of homologous chromosomes, each in the...

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