1. Warm-up 12/11 What are the 3 stages of the cell cycle?
Explain the relationship between a gene, a chromosome, DNA and Nucleotides.

2. Mendel & PROBABILITY
p. 181 and pp

3. heredity: transmission of characteristics from parent to offspring
probability: likelihood an event will happen and can be expressed as percentages, fractions, or decimals

4. Probability =
# of times an event is expected to occur
number of chances for the event to occur
EX Black mice AND 25 white mice
White mice appeared 25 times
Total number of mice was 250
Probability (of getting a white mouse)= 25/250 =
= 0.10 OR 10%
What is the probability of getting a black mouse?

5. Mendel Mendel’s Peas Observed 7 characteristics
Observed 2 traits within each characteristic
EX. CHARACTERISTIC: flower color
TRAIT: purple or white
Observations
purple flowering plants (PFP)  PFP
PFP  white flowering plants (WFP)

6. Mendel’s Experiment P1 Generation White flowers X F1 Generation
Purple flowers
P1 Generation
White flowers X
Self-pollination
F2 Generation
Purple flowers (705)
White flowers (224)

8. Chromosomes and genes
Gene (located on a chromosome) codes for a characteristic (ie flower color)
Different forms of a gene = allele (purple or white)
Letters used to represent alleles
dominant trait capitalized (purple = P)
recessive lower case (white = p)

9. Genotypes and Phenotypes
Genotype: alleles an organism inherits
EX: PP Pp pp
Phenotypes: appearance due to the genotype
EX: PP (purple) Pp (purple) pp (white)
Homozygous: both alleles are alike (PP or pp)
Heterozygous: alleles are different

10. Rules
Law of segregation: paired factors separate during meiosis (formation of gametes)
Law of independent assortment: alleles sort independently of one another (not all dominant appeared together)

11. Homework Read p 173-175 Problems page 178 #1
Read page 179 do problems 1-3