Computing the recombination frequencies

Reference no: EM1389076

You are investigating 4 recessive alleles in corn. They are whimpy ears (w), striped leaves (s), shriveled kernels (k), and red tassels (r). Their dominant counterparts are represented by the "+" symbol. A plant that is homozygous recessive for all four genes (ww ss kk rr) is crossed with a plant that is homozygous dominant for all four genes (++ ++ ++ ++). The F₁ progeny (w+ s+ k+ r+) are then testcrossed with another plant. A total of 1000 F₂ progeny were produced. The F₂ progeny display the following phenotypes.

Phenotype	Observed # of Progeny
w s k r	198
+ + + +	202
w s k +	201
+ + + r	199
w + k +	49
+ s + r	51
w + k r	48
+ s + +	52

a. Calculate the recombination frequencies between each pair of genes. (HINT: you will calculate 6 recombination frequencies - determine where each pair of genes experienced a crossover to produce the observed offspring).

b. Draw a chromosome map for these genes if they are linked.

Reference no: EM1389076

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