WELCOME TO AN SC 221

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WELCOME TO AN SC 221
Introduction to Animal Genetics
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Lecture 1
Introduction to Animal Genetics
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Three Sections of the Course
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Three Sections of the Course
Qualitative Genetics

• Modes of Inheritance -- predict progeny
  phenotypic distribution based on parental
  genotypes

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Three Sections of the Course
Qualitative Genetics

• Modes of Inheritance -- predict progeny
  phenotypic distribution based on parental
  genotypes

Population Genetics

• Gene and genotypic frequencies -- predict
  direction and magnitude of changes in a population

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Three Sections of the Course
Quantitative Genetics

• Assessing genetic merit -- describe traits with
  statistics to predict next record, genetic merit,
  response to selection

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P G E
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Phenotype observed expression of a trait
P G E
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Genotype composite of all genes that influence
a trait
Phenotype observed expression of a trait
P G E
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Genotype composite of all genes that influence
a trait
Phenotype observed expression of a trait
P G E
Environment all non-genetic factors that
influence a trait
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Types of Traits
Qualitative
Quantitative
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Types of Traits
Qualitative
Quantitative

• few loci

• many loci

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Types of Traits
Qualitative
Quantitative

• few loci
• discrete phenotypes

• many loci
• measured phenotypes

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Types of Traits
Qualitative
Quantitative

• few loci
• discrete phenotypes
• little or no effect of the environment

• many loci
• measured phenotypes
• environmental effect can be larger

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UNDERSTANDING GENETIC PRINCIPLES OF INHERITANCE
PREDICT
OUTCOME
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Whats new in genetics?
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Whats new in genetics?

• gene mapping
• using maps to find genes
• sequenced human DNA
• gene therapy
• application to human well being and animal
  productivity/health

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Horns
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No Horns
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Gene interactions Epistasis
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