Mendel discovered the particulate theory of inheritance
University of Vienna
3 Pea Experiments
Purple or white
Axial or Terminal
Yellow or Green
Wrinkled or round
Inflated or constricted
Green or yellow
Tall or dwarf
4 Pea Experiments
Produced True Breeding plant varieties
Always produced same offspring
True breeding parents are called P generation
Hybrid offspring of the P generation is called the F1
If they are fertilized and produce offspring the offspring are called the F2
5 Law of Segregation
Two alleles are packed into separate gametes.
P or p
T or t
7 Law of Independent Assortment
Each pair of alleles segregates to the gametes independently.
9 Rules of Probability
Rule of Multiplication
The probability that independent events will occur simultaneously is the product of their individual probabilities.
Question cross plants that are heterozygous for flower color. What is probability of them being homozygous recessive
10 Rules of Probabilty
Probability that egg will get a p
Probabiltity that sperm will get a p
½ x ½ ¼
11 Rules of probabiltiy
YyRr x YyRr
Probability of YYRR
Egg have Y and R
½ x ½ ¼
Sperm have Y and R
½ x ½ ¼
¼ x ¼ 1/16
12 Rules of Probabiltity
Rule of Addition
The probabilty of an event that can occur in two or more independent ways is the sum of the separate probabilities of the different ways.
13 Rules of Probabiltiy
Cross two Heterozygous for flower color. What is the probability that the offspring is heterozygous
Two ways to be hetero. Either mom give P or p or Dad give P or p
Dom Egg with Rec Sperm
½ x ½ 1/4
14 Rules of Probabiltiy
Dom sperm with rec egg
½ x ½ ¼
Overall ¼ ¼ 2/4 ½
15 Extending Mendel
Four Oclock Flowers
Incomplete Dominance vs Codominance
MN blood groups
Dominance doesnt have to do with which can subdue the other but rather a phenotypic expression.
16 Extending Mendel
Multiple Allele Traits
An individual only gets two out of the possible alleles.
17 Extending Mendel
18 Nature vs. Nurture
Environmental impact on phenotype
Altitude on blood etc
Phenotype integrates the environment and the genotype.
Review various pedigrees to determine
20 Pedigree Symbols 21 Dominant Pedigree 22 Recessive Pedigree 23 X linked Pedigree 24 X Linked Pedigree 25 Non-Nuclear 26 Human genetics
If two people were getting ready to have children but each had a sibling die of a the same recessive disease what would be the probability of each being a carrier What about each at the same time
27 How do you tell a person carries
Chorionic Villus sampling
28 (No Transcript)
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