Unit D: Genetic Processes
Chapter 5: Patterns of Inheritance
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Gregor Mendel used pea plant crosses to follow the transmission of one or two
traits at a time. Given what we know about chromosomes now, we know the
genes for the traits he studied were carried on different chromosomes, and each
gene had two alleles.
Specific Expectations:
D1.1: analyze, on the basis of research, some of the social and ethical implications of
research in genetics and genomics. (5.3)
D2.3: use the Punnett square method to solve basic genetic problems involving
monohybrid crosses, incomplete dominance, co-dominance, dihybrid crosses, and
sex-linked genes. (5.2, 5.3)
D2.4: investigate, through laboratory inquiry or computer simulation, monohybrid
and dihybrid crosses, and use Punnett square method and probability rules to
analyze the qualitative and quantitative data and determine the parent genotype.
(5.2, 5.3)
D3.2: explain the concepts of DNA genes, chromosomes, alleles, mitosis, and meiosis,
and how they account for the transmission of hereditary characteristics according to
Mendelian laws of inheritance. (5.1, 5.2, 5.3)
D3.3: explain the concepts of genotype, phenotype, dominance, co-dominance,
recessiveness, and sex linkage according to Mendelian laws of inheritance. (5.1, 5.2,
5.3)
D3.4: describe some genetic disorders caused by chromosomal abnormalities or
other genetic mutations in terms of chromosomes affected, physical effects, and
treatments. (5.3)
5.1: Understanding Inheritance
pg. 202 - 207
Key Terms: trait, true breeding, cross, P generation, F1 generation, monohybrid cross, F2
generation, dominant, recessive, law of segregation, genotype, phenotype, homozygous,
and heterozygous.
Early Ideas About Inheritance
Developing a Theory of Inheritance: Gregor Mendel’s Experiments
Mendel’s Pea Plant
The Results of Mendel’s True-Breeding Crosses
The Results of Mendel’s F1 Crosses
The Law of Segregation
1–6
pg. 205
1 – 12
pg. 207
Activity 5.1: Tasting is Genetic
1–3
pg. 206
Study Guide: Self Assessment
1 – 13
SG. 68 – 69
Mendel’s Crosses and the Law
of Segregation (5.1)
1–3
SG. 70 – 71
One-Trait (Monohybrid) Crosses
and test Crosses (5.1, 5.2)
1–3
SG. 72 – 73
Learning Check:
Genotype and Phenotype
Review Questions:
5.2: Studying Genetic Crosses
pg. 208 - 218
Key Terms: Punnett square, test cross, dihybrid cross, law of independent assortment,
and chromosome theory of inheritance.
Analyzing Genetic Crosses: Punnett Squares
A Punnett Square Analysis of Mendel’s Experiments
Test Crosses: Determining the Genotype of a Parent That Has a Dominant
Phenotype
Working with Punnett Squares
Practice Problems: 1 – 10
pg. 212
7 – 12
pg. 212
Learning Check:
The Inheritance of Two Traits: Dihybrid Crosses
Developing the Law of Independent Assortment
A Punnett Square Can Model Mendel’s Results
13 – 16
pg. 215
Practice Problems: 11 – 20
pg. 216
Learning Check:
The Chromosome Theory on Inheritance
Sutton Links Mendel’s Work to Chromosome Segregation
Review Questions:
1 – 12
pg. 218
Inquiry Inv. 5 – A: Monohybrid Crosses in Brassica rapa
pg. 228 – 229
Thought Lab 5 – B: Corn Genetics
pg. 230
Thought Lab 5 – C: Dihybrid Crosses
pg. 231
Study Guide: The Law of Independent
Assortment (5.2)
1–2
SG. 74 -75
5.3: Following Patterns of Inheritance in Humans
pg. 219 - 227
Key Terms: pedigree, autosomal inheritance, autosomal dominant, autosomal recessive,
genetic counselor, and gene therapy.
Pedigree
Autosomal Inheritance
Autosomal Dominant Inheritance
Huntington Disease, an Autosomal Dominant Disorder
Autosomal Recessive Inheritance
Cystic Fibrosis, an Autosomal Recessive Disorder
Learning Check:
17 – 22
pg. 223
Genetic Tests
Genetic Testing for Cystic Fibrosis and Huntington Disease
Genetic Counseling
Decisions About Genetic Testing
Gene Therapy: A Cure for Genetic Disorders?
The Future of Gene Therapy
Review Questions:
Activity 5.2: Creating a Pedigree
1 – 13
pg. 227
1–3
pg. 223
Study Guide: Using Pedigrees to Track
Autosomal Recessive Disorders (5.3) 1 – 3
Autosomal Dominant Genetic
Disorders (5.3)
1–2
SG. 76 – 77
SG. 78
Genetic Testing And Gene Therapy 1 – 3
SG. 79 – 80
Bringing It All Together
SG. 81
Practice Test
1 – 13
SG. 82 – 83