To map genes, information about the location and number of crossovers in the gametes that produced the progeny of a cross is needed. An efficient way to obtain this information is to use a three-point testcross, in which an individual heterozygous at three linked loci is crossed with an individual that is homozygous recessive at the three loci
-Write the genotypes of all recombinant and nonrecombinant progeny expected from the following three-point cross:
$\frac{m^+ ~~ p^+ ~~ s^+}{m ~~~~ p ~~~~ s} \times \frac{m ~~~ p ~~~ s}{m ~~~ p ~~~ s}$

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The Answer of To map genes, information about the location and number of crossovers in the gametes that produced the progeny of a cross is needed. An efficient way to obtain this information is to use a three-point testcross, in which an individual heterozygous at three linked loci is crossed with an individual that is homozygous recessive at the three loci
-Write the genotypes of all recombinant and nonrecombinant progeny expected from the following three-point cross:
$\frac{m^+ ~~ p^+ ~~ s^+}{m ~~~~ p ~~~~ s} \times \frac{m ~~~ p ~~~ s}{m ~~~ p ~~~ s}$

To Map Genes, Information About the Location and Number of Crossovers