BI+107+Chapter+14

BI+107+Chapter+14 - Chapter 14 Mendelian Genetics...

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Unformatted text preview: Chapter 14 Mendelian Genetics Terminology • Dominant • Recessive • Gene • Allele • Homozygous • Heterozygous • Phenotype • Genotype Fig. 14-3-3 EXPERI M ENT P Gener ation (tr ue-br eeding par ents) Pur ple flower s White flower s × F 1 Gener ation (hybr ids) All plants had pur ple flower s F 2 Gener ation 705 pur ple-flower ed plants 224 white-flower ed plants Table 14-1 Mendel’s 4 concepts • Alternative versions of genes account for variations in inherited characteristics • For each characteristic an organism inherits 2 alleles, 1 from each parent • I f the 2 alleles are different, the dominant allele determines the organisms phenotype, the other, recessive allele has no noticeable effect. • The 2 alleles separate (segregate) during gamete formation and end up in different gametes (Law of Segregation) Fig. 14-4 Allele for pur ple flower s H omologous pair of chr omosomes Locus for flower -color gene Allele for white flower s Fig. 14-5-3 P Gener ation Appear ance: Genetic makeup: Gametes: Pur ple flower sWhite flower s PP P pp p F 1 Gener ation Gametes: Genetic makeup: Appear ance: Pur ple flower s Pp P p 1 / 2 1 / 2 F 2 Gener ation Sper m Eggs P P PP Pp p p Pp pp 3 1 Fig. 14-6 Phenotype Pur ple Pur ple 3 Pur ple Genotype 1 White Ratio 3:1 (homozygous) (homozygous) (heter ozygous) (heter ozygous) PP Pp Pp pp Ratio 1:2:1 1 1 2 Test cross • You are a Labrador breeder and want to add a new female dog to your breeding program. You purchase a black puppy whose parents were both black....
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This note was uploaded on 09/20/2011 for the course BIO 107 taught by Professor Berney during the Fall '10 term at Montgomery CC.

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BI+107+Chapter+14 - Chapter 14 Mendelian Genetics...

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