Mendel’s Work – pages 110-115
Directions: Read pages 110-115. When you are finished reading, answer questions 1 – 10.
Vocabulary Words to define:
heredity
purebred
alleles
hybrid
trait
Dominate allele
genetics
Recessive allele
gene
1. Gregor Mendel experimented with hundreds of pea plants to understand the process of ________________.
2. Summarize the procedure for Mendel’s experiment.
3. In Mendel’s cross for stem height, what contrasting traits did the pea plants in the P generation
exhibit?
4. What trait or traits did the plants in F1 generation exhibit?
5. When you think of the traits of the parent plants, why is this result surprising?
6. Contrast the offspring in F1 generation to the offspring in F2 generation. What did the differences in
F1 and F2 show to Mendel?
7. What is a dominate allele and how are they represented?
8. What is a recessive allele and how are they represented?
9. Explain how dominant and recessive alleles for the trait of stem height determine whether a pea plant
will be tall or short.
10. Can a short pea plant ever be a hybrid for the trait of stem height? Why or why not? As part of your
explanation, write the letters that represent the alleles for stem height of a short pea plant.
Probability and Heredity – pages 118 – 123
Directions: READ pages 118 – 123. When you are finished reading, answer the questions below.
Vocabulary Words to define:
probability
Punnett Square
homozygous
heterozygous
phenotype
codominance
genotype
1. If you know the parents’ alleles for a trait, how can you use a Punnett square to predict the probable
genotypes of the offspring?
2. A pea plant with round seeds has the genotype Rr. You cross this plant with a wrinkled-seed plant,
genotype rr. What is the probability that the offspring will have wrinkled seeds? (Use a Punnett square
to help with the prediction.
3. Explain how two organisms can have the same phenotype but different genotypes. Give an example.
4. A pea plant has a tall stem, what are its possible genotypes?
5. Describe the difference between heterozygous and homozygous.