1. “The most effective way to cope with change is to help create it.”
10/14/2019
Title: Biology 1/29/07
Objectives:
To learning about Mendelian genetics.
Class Topics
Hand in W.S. “The Puzzle of Heredity” before the bell rings please
Chapter 7 Test
Chapter 8 – Mendelian Genetics
Mendel’s laws
Terminology
Genetics Problems
“The most effective way to cope with change is to help create it.”
L.W. Lynett
Monday, October 14, :59 AM

2. Class Assignments Read 166-170 1/29/07
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Class Assignments
What
By When
Read /29/07
W.S. “The Puzzle of Heredity” 1/29/07
Chapter 8 Quiz 1 1/31/07
Genetics Problems 2/2/07
Due this class period
Due next class period
Due in the future

3. 10/14/2019
Grade Sheet
2A – p. 157 (5 pts.)

4. 10/14/2019
Chapter 7 Test
You will get your test back and be given 20 minutes to adjust any answers.
Hand in test when completed
Begin working on the Math Lab (in your notebook) on page 165

5. Math Lab p. 165 “Calculating Mendel’s ratios” Copy the table
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Math Lab p. 165
“Calculating Mendel’s ratios”
Copy the table
Calculate the ratio
State the ratio in words and then as a fraction
Answer the final question

6. Mendel’s Theory Historical perspective
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Mendel’s Theory
Historical perspective
Heredity was thought of as a blending of the two parents
Mendel determined that there were two separate “heritable factors” for each trait
Factors are called alleles (book says genes)

7. 10/14/2019
Mendel’s hypothesis
1. For each inherited trait, an individual has two copies of the gene – one from each parent.
2. There are different versions of genes.
Alleles
Receive one from each parent

8. Mendel’s hypothesis 3. Dominant allele recessive allele
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Mendel’s hypothesis
3. Dominant allele
Can mask the presence of another allele
Expressed whenever present
Represented by a capital letter
recessive allele
Can be masked by the presence of a dominant allele
Only expressed when contrasting allele is not present
Represented by a lowercase letter (same letter as dominant)

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10. Laws of heredity Law of segregation Law of independent assortment
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Laws of heredity
Law of segregation
The two alleles for a trait separate when gametes are formed
Law of independent assortment
Different genes separate independently from one another during gamete formation
Assuming they’re on different chromosomes
Used in a dihydrid cross

11. Genotype The alleles for a trait Homozygous dominant (true breeding)
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Genotype
The alleles for a trait
Consider the trait “Seed color”
Dominant - Yellow seeds (Y)
Recessive - Green seeds (y)
Homozygous dominant (true breeding) YY
Heterozygous (hybrid) Yy
Mixed pair of alleles
Homozygous recessive (true breeding) yy

12. Phenotype The physical appearance of a trait Tall or dwarf plants
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Phenotype
The physical appearance of a trait
Tall or dwarf plants
Round or wrinkled seeds
Yellow or green seeds

13. 10/14/2019
Mendel’s Cross
Cross a purebreeding smooth pod shape with a pinched pod shape P F1
Pheno
Geno F2

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Practice problem
Using the trait of flower position, cross a hybrid with a purebreeding terminal.
P ___ x ___ F1
Pheno
Geno

15. 10/14/2019
Practice problem
Tall is dominant over short; cross a homozygous recessive with a heterozygous
P ___ x ___ F1
Pheno
Geno

16. Chapter 8 Quiz 1 Review Matching Mendel’s traits Mendel’s success
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Chapter 8 Quiz 1 Review
Matching
Alleles, Dominant, Gene, Genetics, Genotype, Heredity, Homozygous, Heterozygous, Hybrid, Independent assortment, Phenotype, Recessive, Segregation,Trait
Mendel’s traits
Mendel’s success
Genetic symbols
Mendel’s cross