1. Probability & Heredity
Power notes for section 4-2

2. What’s the chance?
Suppose you were to toss a coin 20 times. Predict how many times the coin would land with heads up and how many times it would land with tails up?

3. 2. Principles of Probability
Probability = to predict the results of a particular event
Probability is # that describes how likely an event will occur
What is the chance of getting head?

4. 3. Mathematics of Probability
Since there are only 2 ways a coin can land you say there is a 1 in 2 chance of it landing heads up or tails up.
Also written:
50%

5. 3. Independence of Event
If you toss a coin 5 times and each time it lands heads up. What would you expect to find if you tossed it again?
Answer: There is still a 50% or a 1 in 2 chance of getting heads.
Why: Each event occurs independently of each other

6. Vocabulary nb page 23 Phenotype: Physical appearance of a trait
Genotype: Genetic make up of a trait
Homozygous- has the same alleles for a trait
2 dominant or 2 recessive alleles
Heterozygous- has different alleles for a trait
1 dominant and 1 recessive allele

8. 3. Punnett Squares
Is a chart that shows all the possible combinations of alleles that can result from a genetic cross. T t T T T t T T t t t t

9. 3. Prediction Probabilities

10. Pedigree Chart
A chart used to show phenotypes of genetically related family members