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Question
The probability of a cross-over occurring between two gene loci is proportional to ______.
Options
the activity of the two loci
the distance between the two loci
how far the loci are from the centromere
how tightly the chromosomes are packed in the nucleus
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Solution
The probability of a cross-over occurring between two gene loci is proportional to the distance between the two loci.
Explanation:
The probability of a crossover event occurring between two gene loci on a chromosome is directly proportional to the physical distance between those loci. Genes that are farther apart have a higher chance of recombination because there is more opportunity for a crossover to occur between them during meiosis, breaking the linkage. This relationship forms the basis of genetic mapping, where recombination frequency is used to estimate distances between genes on a chromosome.
