22genetics (1) - Lecture 22: Genetic Inheritance Chapter...

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Lecture 22: Genetic Inheritance Chapter 20: One-Trait Inheritance
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The Big Picture How do we inherit genetic traits from our parents? How do we express the combination of genes that we receive from them?
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Outline of Genetic Inheritance I What is our genetic material ? DNA (deoxyribonucleic acid) What is a gene ? Sequence of DNA that codes for a protein Each gene controls a genetic trait!
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Outline of Genetic Inheritance II Where do we keep our genes? In the nucleus of our eukaryotic animal cells On homologous pairs of chromosomes 23x2=46
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Outline of Genetic Inheritance II Where do we get our genes? Meiosis gives us one copy of each from mom’s egg and one copy from dad’s sperm
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Genes and Alleles Your mother and father are two different people You inherit two different forms of each gene – called alleles E.g. one gene might code for brown eyes and the other for green eyes
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Genotype All of the types of genes of an individual The total combination of alleles that control a trait Designated by a single letter ( E.g. E or e for e arlobe type)
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22genetics (1) - Lecture 22: Genetic Inheritance Chapter...

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