the laws of inheritance. learning goals 1.introduce the laws of inheritance 2.introduce vocabulary...
TRANSCRIPT
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The Laws of Inheritance
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Learning Goals
1. Introduce the laws of inheritance
2. Introduce vocabulary terms used in genetics
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Review
Genes are made of DNA
Segment of DNA is called a gene
Gene is responsible for traits
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Gregory Mendel
Austrian Monk in 1800’sStudied Plants (pea plants)Founded the “Laws of Inheritance”
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Pea Plant Traits
Pea plant traits: Flower colorPea pod colorTexture of seed
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Mendel’s Experiment
1. Crossed opposite traits (purple x white)
2. Offspring were called3. Self pollinated the F1 offspring4. Second generation were called
P generation
F1 generation
F2 generation
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Results:
Some traits were dominant and some recessive
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3 Laws of Inheritance
1. Principle of Dominance2. Principle of Segregation3. Principle of Independent Assortment
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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
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Principle of Segregation
The 2 genes separate during gamete formation
Parent can pass on either gene to offspring
White Purpleor
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Principle of Independent Assortment
Genes separate independently during gamete formation
Each trait is independently inherited
Seed shape has nothing to do with seed color
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Terms to Know
Homozygous- The two genes are the same
Heterozygous- The two genes are different
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Exit Slip
List the 3 laws of inheritance:
Rate Yourself:3= mastered2= kind of get it, needs more explanation1= don’t get it, need help