Unit 4 Chapter 11 Fundamentals of Genetics Section 11.1 Mendel’s Legacy.
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Transcript of Unit 4 Chapter 11 Fundamentals of Genetics Section 11.1 Mendel’s Legacy.
Unit 4 Chapter 11Fundamentals of Genetics
Section 11.1 Mendel’s Legacy
1. Genetics: study of how traits & characteristics are transferred from parent to _________
2. Gregor Mendel: “Father of Genetics”3. Combined
a) Plant breedingb) Statisticsc) Careful recordkeeping
I) Gregor Mendel
1. Mendel experiment a. garden peas with 7 characteristics to see which
trait would be passed to offspring
2. Traits: specific inherited characteristicsa) Example: Characteristic:
Trait:
II) Mendel’s Experiment
II) Mendel’s Experiments3. Mendel started growing peas that were pure
for each traita. Pure:
b. Mendel self-pollinated the peas until:
c. P1 generation:
4. Mendel controlled the reproduction of the plants (___________)
5. Pollination: pollen from reproductive parts of one flower is mixed w/ another flower
II. Mendel’s Experiment
6. Self-pollination: mixing with the same plant/flower
7. Cross-pollination: mixing anther a different plant/flower
II. Mendel’s Experiment
II. Mendel’s Experiments8. Cross Pollinated:
a) Ex: Characteristic: Plant Heightb) Trait: Short x Tallc) Mendel recorded the results & called the offspring
the F1 generation
P1 generation:
Pure Green x Pure Yellow = __ generation
Example
II. Mendel’s Experiments9) Mendel then crossed two F1 generation seeds
P1 generation:
Pure Green x Pure Yellow = __ generation
F1 generation x F1 generation = ____ generation
Example
1. there was a “factor” in pea controlling the traits2. results varied btwn 2 traits he felt that the
“factor” came in __________
III) Mendel’s Results and Conclusions
P1 generation: Pure Green, Pure Yellow
Pure Green x Pure Yellow = F1 generation
F1 generation: 2 Green
F1 gen. x F1 gen. = F2 generation
Green x Green = 3 Green + 1 YellowF2 generation: 3 Green + 1 Yellow
Example
3. Mendel saw that one P1 trait would not show in the F1, and reappear in F2
a. Dominant:
b. Recessive:
III. Recessive and Dominant Traits
IV. Mendel’s Laws1. Law of Segregation: a pair of factors is
segregated, or separated, during the formation of gametes
IV. Mendel’s Laws2. Law of Independent Assortment: factors for
different characteristics are distributed to gametes independently
1. Molecular Genetics: study of structure and function of chromosomes and genes
2. Genes are in pairs or alleles3. Alleles are represented by letters
a. Dominant: b. Recessive:
V. Chromosomes and Genes
Think:Do Ligers really exist?