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Hand in W.S.

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Chapter 8 Mendelian Genetics. Mendel's laws. Terminology. Genetics Problems ' ... To learning about Mendelian genetics. Title: Biology 1/30/07. Objectives: 8 ... – PowerPoint PPT presentation

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Title: Hand in W.S.


1
Class Topics
Title Biology 1/30/07
Objectives
  • To learning about Mendelian genetics.
  • Hand in W.S. The Puzzle of Heredity before the
    bell rings please
  • Chapter 7 Test
  • Chapter 8 Mendelian Genetics
  • Mendels laws
  • Terminology
  • Genetics Problems
  • The most effective way to cope with change is to
    help create it.
  • L.W. Lynett

Monday, September 14, 2015 302 AM
2
Class Assignments
By When
What
  • Read 166-170 1/30/07
  • W.S. The Puzzle of Heredity 1/30/07
  • Chapter 8 Quiz 1 2/1/07
  • Genetics Problems 2/5/07
  • Due this class period
  • Due next class period
  • Due in the future

3
Grade Sheet
2A p. 157 (5 pts.)
4
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 Labp. 165
  • Calculating Mendels ratios
  • Copy the table
  • Calculate the ratio
  • State the ratio in words and then as a fraction
  • Answer the final question

6
Mendels 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
Mendels 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
Mendels 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)

9
(No Transcript)
10
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 theyre on different chromosomes
  • Used in a dihydrid cross

11
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
  • Round or wrinkled seeds
  • Yellow or green seeds

13
Mendels Cross
  • Cross a purebreeding smooth pod shape with a
    pinched pod shape
  • P
  • F1
  • Pheno
  • Geno
  • F2
  • Pheno
  • Geno

14
Practice problem
  • Using the trait of flower position, cross a
    hybrid with a purebreeding terminal.
  • P ___ x ___
  • F1
  • Pheno
  • Geno

15
Practice problem
  • Tall is dominant over short cross a homozygous
    dominant with a heterozygous
  • P ___ x ___
  • F1
  • Pheno
  • Geno

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