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The Laws of Inheritance. Learning Goals 1.Introduce the laws of inheritance 2.Introduce vocabulary terms used in genetics.

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Presentation on theme: "The Laws of Inheritance. Learning Goals 1.Introduce the laws of inheritance 2.Introduce vocabulary terms used in genetics."— Presentation transcript:

1 The Laws of Inheritance

2 Learning Goals 1.Introduce the laws of inheritance 2.Introduce vocabulary terms used in genetics

3 Review Genes are made of DNA Segment of DNA is called a gene Gene is responsible for traits

4 Gregory Mendel Austrian Monk in 1800’s Studied Plants (pea plants) Founded the “Laws of Inheritance”

5 Pea Plant Traits Pea plant traits: Flower color Pea pod color Texture of seed

6 Mendel’s Experiment 1. Crossed opposite traits (purple x white) 2. Offspring were called 3. Self pollinated the F1 offspring 4. Second generation were called P generation F1 generation F2 generation

7 Results: Some traits were dominant and some recessive

8

9 3 Laws of Inheritance 1.Principle of Dominance 2.Principle of Segregation 3.Principle of Independent Assortment

10 Principle of Dominance One trait is masked by another trait There are 2 genes per trait: Dominant trait shows over the recessive trait Purple is dominant over white Purple Gene + White Gene = Purple Flowers White Gene + White Gene = White Flowers Purple Gene + Purple Gene = Purple Flowers

11 Principle of Segregation The 2 genes separate during gamete formation Parent can pass on either gene to offspring White Purple or

12 Principle of Independent Assortment Genes separate independently during gamete formation Each trait is independently inherited Seed shape has nothing to do with seed color

13 Terms to Know Homozygous- The two genes are the same Heterozygous- The two genes are different

14 Exit Slip List the 3 laws of inheritance: Rate Yourself: 3= mastered 2= kind of get it, needs more explanation 1= don’t get it, need help


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