(A) You are interested in understanding the genetics of 3 traits in maize-purple
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Question
(A) You are interested in understanding the genetics of 3 traits in maize-purple leaves and silk color. You cross a pure-bred line of corn that has purple leaves and salmon silk with true-breeding wild type corn. T cross produces 442 seeds that when planted grow into corn plants that have purple leaves and yellow silk. You next cross these plant he s with a green plant that has salmon silk, which results in the following progeny 240 plants with purple leaves & yellow silk · 220 plants with green leaves & salmon silk 36 plants with purple leaves & salmon silk 24 plants with green leaves & yellow silk i) Are the genes influencing leaf color and silk color linked? i) If so, what is the map distance between these 2 genes?Explanation / Answer
Answer:
The given information is dihybrid test cross. Generally, dihybrid test cross ratio is 1:1:1:1, if the geneas are independently assorted. But the number of given progeny deviates from above ratio. So that the genes are said to be linked.
Hint: Always recombinant progeny are less in number than non-recombinants. So the recombinants are purple & salmon silk and green leaves & yellow silk.
Recombination frequency = (no. Of recombinants / total progeny) 100
RF= (60/520)100
= 11.54%
RF=distance between the genes
The distance between genes= 11.54 map units
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