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Lesson 20-21 CrossOver Supplement

Lesson 20-21 CrossOver Supplement - When genes are located...

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When genes are located on different chromosomes, they are assorted independent of one another. An AaBb individual, for example, gives rise to gamete AB, Ab, aB, and ab in equal proportions (25% each) because the chromosomes on which the genes are located are assorted independently during meiosis .
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b.
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% AB
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% AB Ab
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% AB Ab aB
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab 25% AaBb Dom/Dom
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab 25% AaBb Dom/Dom 25% Aabb Dom/Rec
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab 25% AaBb Dom/Dom 25% Aabb Dom/Rec 25% aaBb Rec/Dom
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In the cross AaBb x aabb, therefore, an equal proportion of the four possible phenotypes will be produced if A is dominant to a and B is dominant to b. 25% 25% 25% 25% AB Ab aB ab 100% ab 25% AaBb Dom/Dom 25% Aabb Dom/Rec 25% aaBb Rec/Dom 25% aabb Rec/Rec
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When genes reside on the same chromosome, they are said to be linked (not to be confused with sex linkage); therefore, as the chromosomes go, so go the genes
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A B a b A B a b Heterozygous/Heterozygous With No Crossing Over
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Meiosis I A B a b A B a b Heterozygous/Heterozygous With No Crossing Over A B A B a b a b
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a b a b A B A B Meiosis I Meiosis II A B a b A B a b Heterozygous/Heterozygous With No Crossing Over A B A B a b a b
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