Question:
In genetic analysis, the effect of tight-linkage may create confusion with which of the following events?
In genetic analysis, the effect of tight-linkage may create confusion with which of the following events?
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To distinguish between tight linkage and pleiotropy, scientists often look for extremely rare recombination events or use modern molecular cloning to see if multiple distinct gene sequences are involved.
Updated On: Aug 24, 2026
- Pseudoallele
- Pleiotropy
- Penetrance
- Epistasis
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question explores the conceptual overlaps and potential confusion in genetic observations between physical linkage of genes and the functional effects of a single gene.
In genetic experiments, researchers look at how traits are inherited together or independently.
Step 2: Detailed Explanation:
1. Genetic linkage refers to the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.
2. "Tight linkage" occurs when two different genes are located extremely close to each other on the same chromosome, making the probability of a crossover (recombination) between them very low.
3. Because they are rarely separated, the two traits controlled by these separate genes will almost always appear together in the offspring.
4. Pleiotropy, on the other hand, is a condition where a single gene influences two or more seemingly unrelated phenotypic traits.
5. When traits are pleiotropic, they always appear together because they are controlled by the exact same genetic locus.
6. When researchers observe two traits consistently inherited together, they may find it difficult to determine whether they are seeing one gene affecting multiple traits (pleiotropy) or two different, separate genes that are simply very tightly linked.
7. Historically, many cases thought to be pleiotropy were later discovered to be instances of very tight linkage between discrete genes.
8. Pseudoalleles are also related to tight linkage but specifically refer to genes that mimic alleles because they are so close together; however, the term for the phenotypic "confusion" regarding multiple traits is pleiotropy.
Final Answer:
Tight linkage creates confusion with pleiotropy because in both cases, multiple distinct phenotypic characteristics appear to be inherited as a single unit.
This makes option (B) the correct answer.
The question explores the conceptual overlaps and potential confusion in genetic observations between physical linkage of genes and the functional effects of a single gene.
In genetic experiments, researchers look at how traits are inherited together or independently.
Step 2: Detailed Explanation:
1. Genetic linkage refers to the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.
2. "Tight linkage" occurs when two different genes are located extremely close to each other on the same chromosome, making the probability of a crossover (recombination) between them very low.
3. Because they are rarely separated, the two traits controlled by these separate genes will almost always appear together in the offspring.
4. Pleiotropy, on the other hand, is a condition where a single gene influences two or more seemingly unrelated phenotypic traits.
5. When traits are pleiotropic, they always appear together because they are controlled by the exact same genetic locus.
6. When researchers observe two traits consistently inherited together, they may find it difficult to determine whether they are seeing one gene affecting multiple traits (pleiotropy) or two different, separate genes that are simply very tightly linked.
7. Historically, many cases thought to be pleiotropy were later discovered to be instances of very tight linkage between discrete genes.
8. Pseudoalleles are also related to tight linkage but specifically refer to genes that mimic alleles because they are so close together; however, the term for the phenotypic "confusion" regarding multiple traits is pleiotropy.
Final Answer:
Tight linkage creates confusion with pleiotropy because in both cases, multiple distinct phenotypic characteristics appear to be inherited as a single unit.
This makes option (B) the correct answer.
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