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Ch. 2 notes 8/24/15

by: Cherith Notetaker

Ch. 2 notes 8/24/15 BIOL 3721 - 01

Cherith Notetaker
GPA 3.0
David K Asch, Chester R Cooper & Heather Elizabeth Lorimer

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About this Document

The side notes that correlate with the slides.
David K Asch, Chester R Cooper & Heather Elizabeth Lorimer
75 ?




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This 4 page Bundle was uploaded by Cherith Notetaker on Thursday August 27, 2015. The Bundle belongs to BIOL 3721 - 01 at Youngstown State University taught by David K Asch, Chester R Cooper & Heather Elizabeth Lorimer in Fall 2015. Since its upload, it has received 79 views. For similar materials see Genetics in Biology at Youngstown State University.


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Date Created: 08/27/15
Genetics Chapter 2 82415 Slide 13 Parental refers to the pure breeding or pure strain of the plant gt does not mean parents gt arise from any generation gt by definition parent strains are homozygous Slide 14 F1 first generation gt since the original strain is the parental homozygous generation ie YY yy F1 will grow as a hybrid with heterozygous alleles in a 11 ratio that express the dominant trait gt when strains from F1 are bred together the resulting generation F2 produces a minority of the recessive parental trait in a 31 ratio Slide 16 gt genes are influenced by heredity and environment 0 eg height and weight gt expression of trait can be caused by many genes notjust one Slide 18 gt parental strains will always be homozygous gt F1 are heterozygous and have a single phenotype gt F2 shows variation of homozygous and heterozygous o majority expresses dominant allele Slide 21 gt heterozygous parents will produce heterozygous and homozygous progeny o 12 will be yellow hybrids Yy dominant o 1A will be yellow truebreeds YY dominant o 1A will be green truebreeds recessive Slide 30 gt only homozygous recessive express the recessive phenotype gt dominant phenotype can be expressed by homozygous dominant or heterozygous progeny Slide 31 gt when test crossing to reveal an unknown genotype the unknown is crossed with a homozygous recessive strain tester strain 0 a homozygous genotype will produce progeny that have the dominant phenotype o a heterozygous genotype will produce half of the dominant phenotype and half of the recessive phenotype Slide 34 Dihybrids a strain with two sets of heterozygous genes gt eg Yer gt dihybrids are produced from purebreeding parents that have two sets of homozygous genes gt when dihybrids selfpollinate they produce an F2 933z1 phenotypic ratio 0 P parental 0 916 YR dominant P 0 316 ny recombinant 0 316 Yrr recombinant 0 116 yyrr recessive P Recombinant progeny that expresses a combination of parental phenotypes end of day s notes


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