Below are images of two chromosomes of the same length with genes A through G placed on them at specific locations. Which two genes are most tightly linked (i.e., the most likely to segregate together during meiosis)?

Question

Below are images of two chromosomes of the same length with genes A through G placed on them at specific locations.  Which two genes are most tightly linked (i.e., the most likely to segregate together during meiosis)?

BlackTom AI · Accepted Answer

Begin by restating what the question is asking: which two genes are most tightly linked, i.e., closest together on the chromosome and therefore most likely to segregate together during meiosis.

First, observe the provided image details. The diagram shows a single chromosome with genes C, B, and E positioned at specific spots. The left-to-right order appears to place C, then B (colored magenta), then E on this chromosome. There is no visible information about genes A, D, F, or G in the image, and the prompt mentions two chromosomes with genes A through G but only partial labeling is shown.

Because linkage depends on the physical proximity of genes on the same chromosome, the key data for answering the question are the positions of all gene pairs on the chromosome map. With only C, B, and E labeled, we do not have direct information about how close D and F are to each other (or to the other genes). In other words, the image as shown does not reveal D and F’s locations, so we cannot conclusively compare D–F distance to all other gene-pair distances from this figure alone.

If we had a complete map showing the relative order and spacing of A through G, we would assess linkage by identifying the gene pair with the smallest recombination distance (the tightest linkage). In many classic chromosome-mapping problems, the tightest linkage occurs when two genes are immediately adjacent or separated by the smallest genetic distance on the same chromosome.

With the information given (the visible positions of C, B, and E only) and no data for D, F, A, or G, a definitive determination cannot be made from the figure alone. If the supplied or intended answer is D and F, the reasoning would hinge on those two genes being the closest pair on the chromosome map in the full data set; that is, their physical separation would be smaller than any other gene-pair distance.

To outline the general logic if D and F are indeed closest: two genes that are tightly linked share a small recombination distance, so offspring will contain D and F together more often than with any other gene pair. Any other pair with larger physical separation would recombine more frequently, making them less tightly linked. Conversely, if D and F are not the closest, then another gene pair with smaller distance would be the correct answer, and the D–F option would be incorrect.

In summary: the conclusion depends on the full chromosomal map showing the exact distances between all gene pairs. From the image alone, we cannot confirm D and F as the most tightly linked, since their positions are not depicted here. If your materials indicate D and F are the closest pair on the complete map, then that would justify picking D and F as the most tightly linked; otherwise, repainting the full map or providing the complete set of gene positions would be necessary to determine the correct pair with confidence.

BIOL 1001 (090-095) Unit 1.3 Learning Quiz

Below are images of two chromosomes of the same length with genes A through G placed on them at specific locations. Which two genes are most tightly linked (i.e., the most likely to segregate together during meiosis)?

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