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Multiple Choice
Which of the following represents the correct order of the relative positions of four genes (A, B, C, D) on a chromosome?
A
D - C - B - A
B
C - D - A - B
C
B - A - D - C
D
A - B - C - D
Verified step by step guidance
1
Understand that the problem is asking for the correct order of genes on a chromosome. This involves understanding gene mapping and the linear arrangement of genes.
Consider the concept of gene linkage and recombination frequency. Genes that are closer together on a chromosome are less likely to be separated by recombination during meiosis.
Review the given options: D - C - B - A, C - D - A - B, B - A - D - C, and A - B - C - D. The task is to determine which sequence represents the correct linear order of genes.
Use the principle that the correct order of genes is determined by their physical positions on the chromosome, which can be inferred from experimental data such as recombination frequencies or genetic mapping studies.
Conclude that the correct order is A - B - C - D, as this sequence represents the linear arrangement of genes from one end of the chromosome to the other, based on the given information.