Genetic analysis has shown that three recessive genes d (dwarf), e (enlarged trunk) and f (fine...

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Biology

Genetic analysis has shown that three recessive genes d (dwarf),e (enlarged trunk) and f (fine leaf) are all found on chromosome #1of apple. When a plant that was heterozygous for each of thesemarkers was testcrossed, the following 1000 progenies wereobtained:
wild type- 130 (+++)
fine leaf- 19 (++f)
enlarged trunk- 2 (+e+)
enlarged trunk, fine leaf â€“ 350 (+ef)
dwarf -362 (d++)
dwarf, fine leaf -1 (d+f)
dwarf, enlarged trunk -16 (de+)
dwarf, enlarged trunk, fine leaf- 120 (def)
a) Determine the central gene.
b) Calculate recombination frequencies between each of thesethree pairs of genes.
c) Draw a genetic map for the location of these 3 genes onchromosome #1 of apple. Show the map distances (cM or m.u.) betweeneach loci.
d) Determine the interference among crossover events within theregion of the chromosome containing the three genes.

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Since all the mentioned genes are on the same chromosome theywill be not independently assorted unless there is recombinationoccurring Recombination of genes occurs in the process of gameteproduction by meiosis If no recombination occurs all the genes ofthe same chromosome will be inherited as a whole resulting in aset of progeny showing only the phenotypes of their parentspresent But as we can see in the progeny table there areoffsprings which show a new combination of traits different fromtheir parents Hence it is evident that recombination between thethree genes has occurredIt is important to realize See Answer

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