Multiple Choice
Which of the following processes contributes to genetic variation in sexually reproducing species during meiosis?
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12. Meiosis
Genetic Variation During Meiosis
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Which two genes are most likely to be affected by a crossing over event during meiosis?
A
Genes located on different chromosomes
B
Genes located close together on the same chromosome
C
Genes located far apart on the same chromosome
D
Genes located in non-coding regions
Verified step by step guidance1
Understand the concept of crossing over: Crossing over is a process during meiosis where homologous chromosomes exchange segments of genetic material. This typically occurs during prophase I of meiosis.
Consider the location of genes: Genes located on different chromosomes are not affected by crossing over between them because crossing over occurs between homologous chromosomes, not between different chromosomes.
Evaluate genes located close together on the same chromosome: Genes that are close together on the same chromosome are less likely to be separated by crossing over because the physical distance between them is small, reducing the chance of a crossover event occurring between them.
Analyze genes located far apart on the same chromosome: Genes that are far apart on the same chromosome are more likely to be affected by crossing over. The greater physical distance increases the probability that a crossover event will occur between them, leading to genetic recombination.
Consider genes located in non-coding regions: While crossing over can occur in non-coding regions, the question specifically asks about genes, which are coding regions. Therefore, the location in non-coding regions is not relevant to the likelihood of crossing over affecting specific genes.
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