the laws of inheritance. learning goals 1.introduce the laws of inheritance 2.introduce vocabulary...
TRANSCRIPT
The Laws of Inheritance
Learning Goals
1. Introduce the laws of inheritance
2. Introduce vocabulary terms used in genetics
Review
Genes are made of DNA
Segment of DNA is called a gene
Gene is responsible for traits
Gregory Mendel
Austrian Monk in 1800’sStudied Plants (pea plants)Founded the “Laws of Inheritance”
Pea Plant Traits
Pea plant traits: Flower colorPea pod colorTexture of seed
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
Results:
Some traits were dominant and some recessive
3 Laws of Inheritance
1. Principle of Dominance2. Principle of Segregation3. Principle of Independent Assortment
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
Principle of Segregation
The 2 genes separate during gamete formation
Parent can pass on either gene to offspring
White Purpleor
Principle of Independent Assortment
Genes separate independently during gamete formation
Each trait is independently inherited
Seed shape has nothing to do with seed color
Terms to Know
Homozygous- The two genes are the same
Heterozygous- The two genes are different
Exit Slip
List the 3 laws of inheritance:
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