Mendelian or TransmitionGenetics

7/23/99

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Table of Contents

Mendelian or TransmitionGenetics

Gregor Johann Mendel (1822-1884)

Monohybrid Cross

Mendel's First Three Postulates

Mendel's Explanation

Dihybrid Cross (Two-Factor Cross)

Results of an F2 Dihybrid Cross Between two Heterozygotes

Mendel's "Second Law" (Fourth Postulate)

The Trihybrid Cross

Probability and Genetic Events

Probability and Genetic Events

Genetic Example

Genetic Example:

Use product rule to obtain probability of different genotypes in a dihybrid cross

Genetic Example

Conditional Probability

Chi-Square analysis (c2):

Example: 5474 Round & 1850 wrinkled

Example: 5474 Round & 1850 wrinkled

Probability Value (p)

Human Pedigrees

Author: Biology Department