in a plant, leaf color and leaf shapes are controlled by two linked genes. Leave
ID: 61568 • Letter: I
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in a plant, leaf color and leaf shapes are controlled by two linked genes. Leaves of the wildtype plant are red. A reccesive mutation in this gene causes the gene causes white leaves. Wild-type leaves are pointed, and the reccesisive mutation in the gene causes them to be smooth. The following crosses were perfomed: Cross 1: pure breeding white, smooth X pure breeding wild type gives an F1 where all the progeny are red and pointed. Cross 2: red, pointed F1*pure breeding white, smooth (test cross) gives and F2: 40 white, smooth. 36 red, pointed. 10 white, pointed. 14 red, smooth. what is the recombination frequency between the gene for color and for shape? in a plant, leaf color and leaf shapes are controlled by two linked genes. Leaves of the wildtype plant are red. A reccesive mutation in this gene causes the gene causes white leaves. Wild-type leaves are pointed, and the reccesisive mutation in the gene causes them to be smooth. The following crosses were perfomed: Cross 1: pure breeding white, smooth X pure breeding wild type gives an F1 where all the progeny are red and pointed. Cross 2: red, pointed F1*pure breeding white, smooth (test cross) gives and F2: 40 white, smooth. 36 red, pointed. 10 white, pointed. 14 red, smooth. what is the recombination frequency between the gene for color and for shape? in a plant, leaf color and leaf shapes are controlled by two linked genes. Leaves of the wildtype plant are red. A reccesive mutation in this gene causes the gene causes white leaves. Wild-type leaves are pointed, and the reccesisive mutation in the gene causes them to be smooth. The following crosses were perfomed: Cross 1: pure breeding white, smooth X pure breeding wild type gives an F1 where all the progeny are red and pointed. Cross 2: red, pointed F1*pure breeding white, smooth (test cross) gives and F2: 40 white, smooth. 36 red, pointed. 10 white, pointed. 14 red, smooth. what is the recombination frequency between the gene for color and for shape?Explanation / Answer
Wild type plant has red and pointed leaves (RRPP) (wild type is always dominant)
Recessive mutation makes the leaves white and smooth (rrpp)
cross 1 is rrpp X RRPP
F1 progeny is red and pointed (with genotype RRPP and very less RrPp)= This is so because the genes are linked.
Cross 2: Red pointed F1 (RrPp) crossed with pure, breeding white smooth (rrpp)
Total no. of offsprings = 40+36+10+14 = 100
Total no. of recombinants = 14 (red smooth) + 10 (white pointed) = 24
% recombination = 24/100*100 = 24%
Note:- The two genes are 24 map units apart. When recombination frequency is less than 50%, then only the genes can be linked.
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