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Chapter 8 Mendel & Heredity. Chapter Overview 8.1 Mendel’s Experiment 8.2 Theory and Law of Heredity 8.3 Punnett Squares 8.4 Complex Patterns of Heredity.

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Presentation on theme: "Chapter 8 Mendel & Heredity. Chapter Overview 8.1 Mendel’s Experiment 8.2 Theory and Law of Heredity 8.3 Punnett Squares 8.4 Complex Patterns of Heredity."— Presentation transcript:

1 Chapter 8 Mendel & Heredity

2 Chapter Overview 8.1 Mendel’s Experiment 8.2 Theory and Law of Heredity 8.3 Punnett Squares 8.4 Complex Patterns of Heredity

3 Topic #1-8.1 Origin of Genetics 1800s before DNA Gregor Mendel –A–Austrian monk intrigued with “heredity” Passing of traits from parents to offspring –D–Designed an experiment to show how “genes” were passed down Bred pea plants for color patterns 7 years Observed inheritance patterns

4 Topic #2- Mendel’s Experiment Monohybrid Cross 1– 11– 1 trait flower color Based on this experiment he came up with 4 hypotheses…

5 Mendel’s Hypotheses 1. Alternating forms of genes called alleles

6 Mendel’s Hypotheses 2. For each trait organism has 2 alleles homozygous (AA, aa) –Same 2 alleles = homozygous (AA, aa) heterozygous (Aa) –Different alleles = heterozygous (Aa)

7 Mendel’s Hypotheses 3. When only 1 of the 2 traits in a heterozygous organisms is visible the allele is dominant (R) the non visible is recessive (r) Y o u o n l y s e e “ w h i t e ” w h e n T h e r e a r e 2 s m a l l l e t t e r s ( h o m o z y g o u s r e c e s s i v e ) B e c a u s e t h e l a r g e l e t t e r i s n t t h e r e t o b l o c k i t f r o m s h o w i n g

8 4. The 2 alleles for a character separate during meiosis (gametes) Principle of segregation!! Mendel’s Hypotheses

9 Topic #3- What Mendel’s Experiment Show Us Today Every organism has a genotype –Genetic makeup (AA, Aa, aa) Every organism has a phenotype –Observable (Purple, Purple, White)

10 REVIEW What are the genotypes for Homozygous dominant: Heterozygous: Homozygous recessive: What is a Genotype? What is a Phenotype? What is an Allele? AA aa Aa

11 Monohybrid Practice problems Cross H. Dominant X Heterozygous Cross H. Recessive X Heterozygous Cross Heterozygous X Heterozygous Cross H. Dominant X H. Recessive Practice Worksheet


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