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PETER REDDIEN: Now I'm going to stick
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with this example for the purposes of talking
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about independent assortment.
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And we will consider other possibilities
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for this paralyzed strain.
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So our hypothesis one was that there
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was one gene, this paralyzed gene,
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that caused this phenotype.
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And to be paralyzed, you had to be homozygous for this para ts
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allele.
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All right, so now hypothesis two.
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There are two genes, and to be paralyzed,
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you need to be homozygous for an allele of each gene.
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So para ts.
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So you need to be homozygous for this para ts allele.
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And you need to be homozygous for allele
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of a second gene called shibere.
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S-H-I-B-E-R-E, shibere.
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Hypothesis three, there's two genes, paralyzed and shibere.
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But to have the paralyzed phenotype,
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you need to be homozygous for one or the other.
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So I'm saying you have to be homozygous here.
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So we're talking about--
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with these hypotheses, we're still talking about the trait
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being recessive in all of these hypotheses.
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We know it's recessive from our crosses.
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Now I'm going to assume as we go through this that we're working
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with true breeding strains.
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2392
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