*Gregor Johann Mendel 1822-1884

  • View

  • Download

Embed Size (px)


Chapter 3: Mendelian Genetics. Two main hypotheses on how traits are transmitted: *blending inheritance *particulate inheritance. *Gregor Johann Mendel 1822-1884. Pisum sativum. -Why study (or experiment with) the garden pea?. -Mendel followed several visible features:. The Monohybrid Cross. - PowerPoint PPT Presentation

Text of *Gregor Johann Mendel 1822-1884

  • *Gregor Johann Mendel 1822-1884Chapter 3: Mendelian GeneticsTwo main hypotheses on how traits are transmitted:*blending inheritance *particulate inheritancePisum sativum-Why study (or experiment with) the garden pea?-Mendel followed several visible features:

  • The Monohybrid Cross-Example:XTallDwarfP1F1 all TallF2

  • Mendels Principles of Inheritance*unit factors1. Unit factors occur in pairsTallDwarfP1Factors: DD dd Dd

  • 2. Dominance/RecessivenessMendels Principles of Inheritance contXTallDwarfP1DD ddF1 all TallTallDd

  • Mendels Principles of Inheritance cont3. Segregation DD ddXTallDwarfP1F1 all TallTallDd

  • DdDdTallTallMendels Principles of Inheritance contWhat about the F2?Self cross F1:

  • The Test Cross: One Character-How to distinguish DD or Dd genotype?*Test cross

  • Punnett SquaresTallTallSelf cross F2:Dd DdXGamete formation:

  • CH3 Problem #2:2. Albinism in humans is inherited as a simple recessive trait. Determine the genotypes of the parents and offspring for the following families. When two alternative genotypes are possible, list both. (A) Two non albino (normal) parents have five children, four normal and one albino. (B) A normal male and an albino female have six children, all normal.

  • Mendelian inheritance is based on probabilityExample- coin toss

  • The Rule of Addition

  • Chi-Square Analysis:p value (probability): consider as a percentage (i.e. 0.05 = 5%)