MIDTERM LESSON 1: Dihybrid crosses: The Principle of Independent Assortment (Lesson 3)

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Last updated 1:02 PM on 9/4/26
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5 Terms

1
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haploid gametes

produced by a plant contain one copy of each gene.

<p>produced by a plant contain one copy of each gene.</p>
2
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THE PUNNETT SQUARE METHOD

- Used when showing the cross between one or two genes.

- Gametes are write down and combine them systematically to generate the array of zygotic phenotype

<p>- Used when showing the cross between one or two genes.</p><p>- Gametes are write down and combine them systematically to generate the array of zygotic phenotype</p>
3
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Dihybrid cross

G = yellow (dominant)

g = green (recessive)

W = round (dominant)

w = wrinkle (recessive)

<p>G = yellow (dominant)</p><p>g = green (recessive)</p><p>W = round (dominant)</p><p>w = wrinkle (recessive)</p>
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Phenylketonuria (PKU)

- caused by a recessive allele that doesn't code for the enzyme that breaks down the amino acid phenylalanine.

- This disease can result in mental retardation or death

<p>- caused by a recessive allele that doesn't code for the enzyme that breaks down the amino acid phenylalanine.</p><p>- This disease can result in mental retardation or death</p>
5
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THE FORKED-LINE METHOD

- Another procedure for predicting the outcome of a cross involving two or more genes.

- Tallying the gametes in a diagram of branching lines.

<p>- Another procedure for predicting the outcome of a cross involving two or more genes.</p><p>- Tallying the gametes in a diagram of branching lines.</p>