Question

Genetic distances within a given linkage group: a. can only be determined for alleles located on...

Genetic distances within a given linkage group:

a. can only be determined for alleles located on the same chromosome

b. cannot exceed 50 cM

c. can only be determine for alleles located on different chromosomes

d. cannot exceed 100 cM

e. are more accurate if genes are located closer together

f. are more accurate if genes are located farther apart

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Answer #1

The correct options are b and f.

Maximum genetic distance is measured just less than 50 cM. If two genes are greater than 50 cM apart, then we cannot determine if they exist on the same chromosome or are on different chromosomes.

If the genes are far apart on the chromosome, then the cross over and pairing will occur every time and an equal number of parental and recombinant chromosomes will be produced. The distances between the genes are equal to the % of chromosomal crossover events that occur between different alleles.

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