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Unit 4: Mendelian Genetics

Unit 4: Mendelian Genetics. Section 2- Mendelian Inheritance. I. Probability. The likelihood that a certain event will occur. Used to determine the pattern of inheritance of a trait. Formula: (# of times it is expected to occur) (# of times it could occur)

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Unit 4: Mendelian Genetics

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  1. Unit 4: Mendelian Genetics Section 2- Mendelian Inheritance

  2. I. Probability The likelihood that a certain event will occur. Used to determine the pattern of inheritance of a trait. Formula: (# of times it is expected to occur) (# of times it could occur) Ex: Mendel got 705 purple plants and 224 white plants. What is the probability of getting a purple plant? 705/929=76%

  3. Used to find genotypes and predict outcomes Shows every possible combination of mother’s alleles and father’s alleles Ex: P=purple allele p=white allele Purple is dominant-overpowers white allele 75% purple 25% white II. Punnett Squares

  4. III. Determining Genotypes Testcross- if genotype is unknown, cross with the homozygous recessive individual. RR x rr= Rr (Red x white=red) Rr X rr= 50%Rr(red) 50% rr (white) rr x rr= rr (white)

  5. A round pea is crossed with a wrinkled pea. Round is dominant. What are the genotypes of the F1 generation? What are the genotypes of the F2 generation? IV. Practice

  6. IV. Practice • Green is dominant to yellow in pea pods. Cross a heterozygous green with a yellow plant. Give the genotypic and phenotypic ratios.

  7. V. Example • Mendel bred 7324 plants. He got 5474 round peas and 1850 wrinkled. • Which is the dominant trait? • What is the probability of getting the dominant phenotype? • What are the genotypes and phenotypes of the parents?

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