Chapter2Mendel's Principles of Heredity
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Sections to study2.1Background:The historical puzzle ofinheritance2.2Mendel's approachtogenetic analysis2.3Mendelianinheritancein humans.2-2
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-2 2.1 Background: The historical puzzle of inheritance 2.1 Background: The historical puzzle of inheritance 2.2 Mendel 2.2 Mendel’s approach to genetic analysis s approach to genetic analysis 2.3 Mendelian Mendelian inheritance in humans. inheritance in humans. Sections to study Sections to study
2.1Background:The historical puzzle ofinheritanceArtificial selection:Purposeful control over mating by choice ofparents for the nextgeneration.An important practice since before recorded history.SelectivebreedingofplantsDomesticationofanimals2-3
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-3 2.1 Background: The historical puzzle of inheritance 2.1 Background: The historical puzzle of inheritance Artificial selection Artificial selection: Purposeful control over mating by choice of : Purposeful control over mating by choice of parents for the next generation. parents for the next generation. An important practice sinc An important practice since before recorded history. e before recorded history. Selective breeding of plants Selective breeding of plants Domestication of animals Domestication of animals
The 2800-yr old Assyrian reliefFig.2.42-4
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-4 The 2800-yr old Assyrian relief Fig. 2.4
By19th century,plant and animal breeders had created manystrains in which offspring often carried a prized traitBreeders could not explain why a valued trait wouldsometimes disappearand thenreappearin only someoffspring.2-5
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-5 By 19th century, plant and animal breeders had created many century, plant and animal breeders had created many strains in which offspring often carried a prized trait. strains in which offspring often carried a prized trait. Breeders could not explain why a valued trait would Breeders could not explain why a valued trait would sometimes disappear and then sometimes disappear and then reappear in only some reappear in only some offspring. offspring