Wed., Dec. 4 th D3: “Life Lesson” Please copy this: – When my teacher is absent, I am a...

Wed., Dec. 4th D3: “Life Lesson”• Please copy this:– When my teacher is absent, I am a reflection of him or her.

My actions during class and towards the substitute are my own, but also are a reflection of my teacher and my respect for him or her.

• Read this from CofC’s Honor Code:

• If you’d like to leave me a note about any of this, or come talk to If you’d like to leave me a note about any of this, or come talk to me, please do--Anonymously or not.me, please do--Anonymously or not.

Chapter 9

Who’s the Who’s the Father of Modern Genetics??• 1843: – Austrian monastery

• Job = – gardening

• 1851: – University of Vienna– Studied math and

science• Statistics!!!

Gregor Mendel!Gregor Mendel!

Mendel’s Gardening ResearchMendel’s Gardening Research

• Experimented on

Characteristics Traits_________

Characteristics and TraitsCharacteristics and Traits

Mendel’s ObservationsMendel’s Observations• Seeds from purple flowers produce...• Seeds from white flowers produce...• Seeds from tall plants...• Seeds from short pants...• This always true?

3 Steps of Mendel’s Experiments3 Steps of Mendel’s Experiments

1.1.

P: P:

Self PollinationSelf Pollination

2.2.

F1:F1:

Cross Cross Pollination Pollination

3.3.

F2: F2: Ratio of offspring:Ratio of offspring:

P generationP generation

FF1 1 Generation Generation

FF2 2 Generation Generation

Statistics 3 of 4 are purple Statistics 3 of 4 are purple

Cross-pollinationCross-pollination

Self-pollinationSelf-pollination

Mendel’s Experiments Mendel’s Experiments Continue...Continue...

• 100s of times100s of times• Lots of other traitsLots of other traits• All the same results!!All the same results!!• 3:1 “phenotypic” ratio3:1 “phenotypic” ratio

Mendel’s ConclusionsMendel’s Conclusions

Review of His ResultsReview of His Results

RecessiveRecessive vs. vs. DominantDominant

What are YOU?What are YOU?Class Ratios:

Conclusions: LAWSConclusions: LAWS• Law of segregation

• Why/How?– Online Animation!

9.2 Part A

GENETIC CROSSES

Gene vs. AlleleGene vs. Allele

Genome

GENOTYPE AND GENOTYPE AND PHENOTYPEPHENOTYPE

Homozygous and Homozygous and HeterozygousHeterozygous