Name: _____________________________________________________________ Class: _______________
Chapter 7: Genetics and Inheritance
Section 7-1: The Work of Gregor Mendel
Gregor Mendel and the Garden Pea (page 117)
Genetics:
Describe Gregor Mendel.
Who?
What?
When?
Where?
How did Mendel add a “twist” to his research?
List 4 reasons why the garden pea was a good subject for scientific study.
1.
2.
3.
4.
Define self-fertilization:
Define cross-fertilization:
Mendel’s Experiment (page 118)
Step One: Creating the parent (P) generation (Pure Breeding)



Step Two: Cross-Breeding plants from P Generation to create F1 Generation



Results of Step Two: When Mendel crossed a true breeding purple plant with a true breeding white plant, all
of the offspring had _______________ flowers.
Step Three: Self-pollinated one of the purple flowered plants from the F1 Generation to create an F2
Generation



Mendel’s Quantitative Results: Total Pea Plants in F2 Generation = ___________
Pea Plants with Purple Flowers = ___________
Pea Plants with White Flowers
= ___________
What % of Mendel’s F2 Generation had purple flowers?
(purple flowers / total flowers) x 100 = __________%
What % of Mendel’s F2 Generation had white flowers?
(white flowers / total flowers) x 100 = ___________%
The ratio of purple to white flowers in Mendel’s F2 Generation is ____ : _____.
List 3 other pea plant traits that Mendel studied.
1.
2.
3.
Mendel’s Experiments (page 119)
Use Table 7-1 on page 119 to complete the missing boxes in the chart below.
Contrasting Traits in Pea Plants
Trait
Contrasting Form of
Traits
Flower Color
Purple and White
Seed Color
Round and Wrinkled
Pod Color
F2 Generation Ratios
705:224
6,022:2,001
Which trait showed up
more often?
Purple
Yellow
Round
428:152
Mendel’s Explanation of the Results (VERY IMPORTANT VOCABULARY)
Factors:
Alleles:
Traits:
Dominant Traits:
Recessive Traits:
Genotype:
Homozygous (pure bred):
Heterozygous (hybrid):
Dominant Allele + Dominant Allele = ____________________
Dominant Allele + Recessive Allele = ____________________
Recessive Allele + Recessive Allele = ____________________
Phenotype:
Mendel’s Conclusions (page 122)
Law of Segregation:
Law of Independent Assortment:
Punnett Squares and Probability
Punnett Square:
Probability:
Visualizing Mendel’s Model (pages 120-1)





Choose a letter to represent the trait being modeled
Upper case letter represents dominant form of trait (dominant allele)
Lower case letter represents recessive allele
Parent genotypes go on the outside of the box (segregating one allele to each box)
Offspring genotypes (fertilized together) go on the inside of the boxes
Punnett Square Modeling Mendel’s Parent to F1 Generation: Flower Color
Phenotype of the Parent Generation: ___________________________________
Genotype of the Parent Generation: ____________________________________
Punnett Square Modeling Mendel’s F1 to F2 Generations: Flower Color
Phenotype of the Parent Generation: ___________________________________
Genotype of the Parent Generation: ____________________________________