Additional slides from lecture 9

Genetics: A Conceptual Approach

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Unformatted text preview: Which is NOT an acceptable notation for two linked genes, A and B, in a heterozygote? a. b. c. d. AB/ab e. All of the above are acceptable notations. Which is NOT an acceptable notation for two linked genes, A and B, in a heterozygote? a. b. c. d. AB/ab e. All of the above are acceptable notations. Alleles from different genes do not occupy the same locus on homologous chromosomes Which is NOT an acceptable notation for two linked genes, A and B, in a heterozygote? a. b. c. d. AB/ab e. All of the above are acceptable notations. Unlinked genes : Aa Bb Linked genes : A B or A B or AB/ab a b a b Which is NOT an acceptable notation for two linked genes, A and B, in a heterozygote? a. b. c. d. AB/ab e. All of the above are acceptable notations. Unlinked genes : Aa Bb Linked genes : A B cis configuration a b A b trans configuration a B In a testcross of two genes, which of the following is correct? 0% 50% 0% >0% & <50% a. % recombinant progeny = a.% recombinant progeny = a.% recombinant progeny = a.% recombinant progeny = 0% 0% >0% & <50% 50% If 2 genes are unlinked : 50% >0% & <50% 50% 0% If 2 genes are partially linked : If 2 genes are completely linked : In a testcross of two genes, which of the following is correct? 0% 50% 0% >0% & <50% a. % recombinant progeny = a.% recombinant progeny = a.% recombinant progeny = a.% recombinant progeny = 0% 0% >0% & <50% 50% If 2 genes are unlinked : 50% >0% & <50% 50% 0% If 2 genes are partially linked : If 2 genes are completely linked : Testcross of 2 unlinked genes 1:1:1:1 ratio (50% recombinant) 50% recombinant Genes assort independently Testcross of 2 completely linked genes 1:1 ratio (all nonrecombinant) 0% recombinant Genes DO NOT assort independently No crossing over More nonrecombinants than recombinants Testcross of 2 partially linked genes 0% < recombinant < 50% Genes DO NOT assort independently Crossing over in some (but not all) meiotic cells In this testcross, what is the % recombination between gene M and gene D?...
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This note was uploaded on 05/06/2010 for the course BIO 311 taught by Professor Otto during the Spring '10 term at George Mason.

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Additional slides from lecture 9 - Which is NOT an...

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