The Map Distances for Genes That Are Close to Each

question 19

Multiple Choice

The map distances for genes that are close to each other are more accurate than map distances for genes that are quite far apart because:

• A) with genes that are far apart, double crossovers and other multiple-crossover events often lead to lethal recombinants that reduce the number of recombinant progeny.
• B) with genes that are far apart, double crossovers and other multiple-crossover events often lead to nonrecombinant or parental offspring and thus reduce the true map distance.
• C) crossover interference will cause more double crossovers and other multiple-crossover events to occur than would be expected and thus result in a higher number of recombinant progeny than expected to occur with genes that are far apart.
• D) double crossovers and other multiple-crossover events occur more often when genes are close to each other and can be readily detected, so these map distances are more accurate than those for genes that are far apart.
• E) when genes are far apart, single-crossover recombinant classes are more difficult to detect than when genes are close together.

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