Three genes with recessive mutant phenotypes are located on the same chromosome in maize: short stem...
Three genes with recessive mutant phenotypes are located on the same chromosome in maize: short stem (ss), defective endosperm (de), and virescent seedling (v). A plant with all three mutant phenotypes is crossed with a true-breeding, wild-type plant. Resulting F1 plants are then backcrossed to the parental mutant line to produce the following progeny:
Waxy Shrunken Virescent Number
ss + + 290
+ de v 282
ss de + 89
+ + v 92
+ de + 480
ss + v 477
+ + + 1482
ss de v 1475
Draw a chromosome map with the correct distances (rounded to the nearest cM) noted between
adjacent pairs of genes.
Homework Answers
To find the gene order, see the parents genotype, whose no. will be always higher then check the genotype of double cross over , whose no. will be always less. After that arrange gene order in parental genotype to get double recombinant.
Gene order = + + +
ss v de
To find distance between 2 consecutive gene, add double cross over recombinants to the no. of single recombinant after single cross over and divide it by total no. of progeny
Distance between gene ss and gene v = 16.13 CM
Distance between gene v and gene de = 24.38 CM
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Three genes with recessive mutant phenotypes are located on the
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2) Emerson mapped three genes in maize: one for green ( V −) or
yellow seedling ( vv ); one for rough leaf Gl −) or glossy leaf gl
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Answer the following questions analyzing the three...
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