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Solution
Researchers often use pure breeding lines for measuring genetic linkages. This allows the researcher to be sure that he/she is working with homozygous genotypes. If a parent is known to be homozygous, then all of its gametes will have the same genotype. This simplifies the definition of parental genotypes and therefore the calculation of recombination frequencies.
The map of the genes is as follows -
Genetic maps are useful for showing the order of loci along a chromosome, but the distances are only an approximation.
The correlation between recombination frequency and map distance is more accurate for short distances (low RF values) than long distances.
This is because as the distance between loci increases, so does the possibility of having a second (or more) crossovers occur between the loci.
Researchers often use pure breeding lines for measuring genetic linkages. This allows the researcher to be sure that he/she is working with homozygous genotypes. If a parent is known to be homozygous, then all of its gametes will have the same genotype. This simplifies the definition of parental genotypes and therefore the calculation of recombination frequencies.
The map of the genes is as follows -
Genetic maps are useful for showing the order of loci along a chromosome, but the distances are only an approximation.
The correlation between recombination frequency and map distance is more accurate for short distances (low RF values) than long distances.
This is because as the distance between loci increases, so does the possibility of having a second (or more) crossovers occur between the loci.