lecture9 - Mendel's Second Law: Independent Assortment This...

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Mendel's Second Law: Independent Assortment • This law states that the segregation of one pair of alleles at a particular locus is not "linked" to the segregation of any other pair of alleles during gamete formation. • Let's look at the dihybrid cross: –TtGg x TtGg
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Consider this: • P TTGG x ttgg • F1 TtGg • But, are the TG and tg alleles from the original parents linked, "stuck together"? • If so, the following gametes can be formed (TG and tg) and a punnet square would predict a 3/1 ratio of tall, green pod plants to short, yellow pod plants.
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If they are independently assorting, • A 9/3/3/1 ratio is expected, and that's what he got, every time!!! TtGg x TtGg
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making a Punnet square… The "Branch Diagram" or "Line method" For the previous cross… act as if the traits are separate! TtGg x TtGg Tt x Tt = 3T/1t Gg x Gg = 3G/1g SO. .. 3T
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This note was uploaded on 09/23/2009 for the course BIO 150 taught by Professor Schmidt during the Spring '08 term at SUNY Stony Brook.

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lecture9 - Mendel's Second Law: Independent Assortment This...

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