Study Guide
Chapter 3: Genetics—The Science of Heredity
Name:
Class:
Date:
3.1: What Is Heredity
1. If a dominant allele is present, this is physical trait will/will not appear in the
organism.
2. RR means?
3. Rr means?
4. rr means?
5. Gene:
6. Hybrid:
7. Allele:
3.2: Probability and Heredity
1. Mendel used the principles of
to predict what percent
of offspring would show a particular trait.
2. Probability:
3. What does a Punnett square show?
4. Be able to calculate the probability of two given parents to produce a particular
offspring—use Punnett square. See the end of the study guide.
5. Understand concept: if one die is rolled then the probability that the die lands on
any one individual number is one in six.
What Are Phenotype and Genotype?
1. What is the difference between genotype and phenotype?
2. What is the difference between homozygous and heterozygous?
3. Can an organism be homozygous for some traits and heterozygous for other
traits?
3.3: Patterns of Inheritance
1. Example of incomplete dominance:
2. Example of co-dominance:
3. Example of multiple alleles:
4. Example of polygenetic inheritiance:
5. Define co-dominance:
How Do Genes and the Environment Interact?
3.4: Chromosomes and Inheritance
1. On what are genes carried?
2. Define meiosis.
3. What happens during meiosis? (know key concept from page 96)
4. How many chromosomes does each human sex cell have and contribute to an
offspring?
Be able to answer questions from Punnett squares similar to these.
g
g
F1 Generation
F2 Generation
g
G
g
G
gg
gg
G
GG
GG
gg
gg
g
Gg
Gg
G = Green Pea Pod
g = Yellow Pea Pod
Which trait is considered dominant?
Which trait is considered recessive?
Which generation has a parent that is a hybrid?
Which generation has both parents as purebred?
What is the phenotype of the offspring in F1 generation?
In F2 generation what percent of the offspring might have yellow pea pods?
What are the genotypes of yellow pea pods?