23genetics2 (1) - receives one member from each homologous...

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Lecture 23: Genetic Inheritance Chapter 20: Two-Trait Inheritance
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The Big Picture What happens when we examine multiple genetic traits at the same time?
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Multiple Traits You are a combination of thousands of different genetic traits We have 23 pairs of chromosomes to carry all of our genetic information in pairs of genes ( alleles )
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Two-Trait Crosses If we want to examine the probability of producing offspring with two traits , we must use a Punnett square Step 1: form all possible gametes
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Gametes Each gamete
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Unformatted text preview: receives one member from each homologous pair of chromosomes Homologues separate, so gamete receives either S or s AND W or w Independent alignment: either homologue can end up in either gamete so any combination is equally possible Genetic Trait Probability Step 1: Determine the genotypes of the parents Step 2: Determine all possible gametes of the parents Step 3: Determine all possible combinations of all parent gametes Step 4: Determine probabilities of all...
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23genetics2 (1) - receives one member from each homologous...

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