Lecture 7 Slides_1

# Lecture 7 Slides_1 - Announcements Bb Discussion post...

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Announcements Bb Discussion post questions Exam review 2/5 7PM, Coker 201 6-1

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Monohybrid  crosses reveal units  of inheritance and Law of  Segregation . Fig.2.9 Almost perfect  ratio of 3:1!!
Alternative forms of traits are alleles Each trait carries two copies of a unit of inheritance Allele for Green Peas Allele for Green Peas Allele for Yellow Peas Pair of  Homologous  Chromosomes Locus for  Pea Color Gene

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Fig. 2.10 Law of  Segregation
Fig. 2.11 The Punnett  Square

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Rules of Probability Independent events : probability of two events occurring together What is the probability that both A and B will occur? Mutually exclusive events : probability of one or another event occurring. What is the probability of A or B occurring? Product Rule = determine probability of each and multiply them together. Sum Rule = determine the probability of each and add them together.
Probability and Mendel’s  Results Cross Yy x Yy pea plants.   Chance of Y sperm uniting with a Y egg ½ chance of Y allele from sperm ½ chance of Y allele from egg Chance of Y and Y uniting = ½ x ½ = ¼ Chance of Yy offspring ½ chance of sperm with y allele and egg with Y allele ½ chance of sperm with Y allele and egg with y allele Chance of Yy =  (½ x ½) + (½ x ½) = 2/4, or 1/2

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Further crosses confirm  predicted ratios. Fig. 2.12
Genotypes versus  phenotypes Yy  ×  Yy 1:2:1 YY:Yy:yy 3:1 yellow: green Fig. 2.13 How can you tell pure breeding individuals  (homozygous dominant) from  hybrid individuals (heterozygous dominant)?

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Lecture 7 Slides_1 - Announcements Bb Discussion post...

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