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NEET Exam  >  NEET Test  >  Biology Class 12  >  Test: Linkage and Recombination (NCERT) - NEET MCQ

Linkage and Recombination (NCERT) - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: Linkage and Recombination (NCERT) (10 Questions)

You can prepare effectively for NEET Biology Class 12 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Linkage and Recombination (NCERT)". These 10 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Linkage and Recombination (NCERT) - Question 1
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Linkage was described by Morgan in Drosophila. Which of the following combinations are correct?

(i) He hybridised yellow bodied, white-eyed females to brown-bodied, red eyed males and then intercrossed their F1

(ii) The ratio of F2 generation is same as that of 9:3:3:1 in this cross.

(iii) The parental combinations are observed more than recombinants.

(iv) According to Morgan Linkage was observed due to chemical association of genes.

(v) All the genes present on same chromosomes have same efficiency to link.

 

Detailed Solution: Question 1

Morgan observed that in his experiments with Drosophila, the F2 generation did not exhibit the expected 9:3:3:1 ratio due to linkage, with parental combinations being more frequent than recombinants. He attributed linkage to the physical association of genes on the same chromosome, not their chemical association. Thus, options (i) and (iii) are correct.

NCERT Topic: Linkage and recombination

NCERT Line: "he hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny. He observed that the two genes did not segregate independently of each other and the F2 ratio deviated very significantly from the 9:3:3:1 ratio (expected when the two genes are independent)." "the proportion of parental gene combinations were much higher than the non-parental type. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome and the term recombination to describe the generation of non-parental gene combinations." "some genes were very tightly linked (showed very low recombination) while others were loosely linked (showed higher recombination)."

Test: Linkage and Recombination (NCERT) - Question 2
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Genes for which of the following characters in Drosophila were found to be very tightly linked by Morgan?

Detailed Solution: Question 2

Morgan found that the genes for body colour and eye colour in Drosophila were very tightly linked, showing minimal recombination between them.

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Test: Linkage and Recombination (NCERT) - Question 3
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Morgan coined the term recombination to describe

Detailed Solution: Question 3

Morgan coined the term "recombination" to describe the generation of new, non-parental gene combinations due to crossing over during meiosis.

question 3 question is incomplete
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Apologies for the incomplete question. Here is the revised and complete version of

NCERT Topic: Linkage and recombination

NCERT Line: "Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome and the term recombination to describe the generation of non-parental gene combinations."

Test: Linkage and Recombination (NCERT) - Question 4
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Choose the correct statement about recombination and linkage

Detailed Solution: Question 4

Genetic maps are constructed using the frequency of recombination between gene pairs, which helps in determining the relative positions of genes on a chromosome. Options A and B are incorrect, as complete linkage results in only parental types, and T.H. Morgan did not construct the first chromosome map but contributed to the development of genetic mapping concepts.

NCERT Topic: Linkage and recombination

NCERT Line: "His student Alfred Sturtevant used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and 'mapped' their position on the chromosome."

Test: Linkage and Recombination (NCERT) - Question 5
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Depending upon the distance between any two genes which is inversely proportional to the strength of linkage, cross overs will vary from

Detailed Solution: Question 5

The strength of the linkage is determined by the distance between the two genes. Greater the distance lower will be the linkage strength. The linkage is broken down due to the phenomenon of crossing over which occurs during meiosis.Crossing over will be relatively more frequent if the distance between the two genes is more than in a case where the distance between two genes is lesser.Depending on the distance between any two genes which is inversely proportional to the strength of linkage. The crossovers will similarly vary from 0-50% and will never exceed 50%.
So, the correct answer is '0-50%'.

Test: Linkage and Recombination (NCERT) - Question 6
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Which of the following statements accurately describes linked genes?

Detailed Solution: Question 6

Linked genes are those located near each other on the same chromosome. This proximity means that they do not assort independently and tend to segregate together during meiosis, which violates the law of independent assortment. Thus, Option A accurately describes linked genes.

NCERT Topic: Linked genes

NCERT Line: "Later, it was found that Mendel's law of independent assortment does not hold true for the genes that were located on the same chromosomes. These genes were called as ‘linked genes'. Closely located genes assorted together, and distantly located genes, due to recombination, assorted independently."

Test: Linkage and Recombination (NCERT) - Question 7
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Today ________ are extensively used as a _______ point in the sequencing of whole genome

Detailed Solution: Question 7

Genetic maps are extensively used as a starting point in genome sequencing projects to understand gene locations and relationships.

NCERT Topic: Genetic maps, starting

NCERT Line: "Today genetic maps are extensively used as a starting point in the sequencing of whole genomes as was done in the case of the Human Genome Sequencing Project, described later."

Test: Linkage and Recombination (NCERT) - Question 8
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Morgan observed tight linkage in Drosophila with only 1.3 percent recombination for

Detailed Solution: Question 8

Morgan observed that white eye and yellow body traits in Drosophila were very tightly linked, with a low recombination frequency of only 1.3 percent, indicating very close linkage.

NCERT Topic: Linkage and recombination

NCERT Line: "he found that the genes white and yellow were very tightly linked and showed only 1.3 per cent recombination"

Test: Linkage and Recombination (NCERT) - Question 9
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What is incorrect for genetic maps?

Detailed Solution: Question 9

Genetic maps are indeed a measure of gene distance on the same chromosome, and they are used in genome sequencing projects. The incorrect statement is Option A, as Alfred Sturtevant used a dihybrid test cross to create genetic maps, not a monohybrid test cross.

NCERT Topic: Linkage and recombination

NCERT Line: "His student Alfred Sturtevant used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and 'mapped' their position on the chromosome."

Test: Linkage and Recombination (NCERT) - Question 10
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Select the correct statement from the ones given below with respect to dihybrid cross.

Detailed Solution: Question 10

In a dihybrid cross, tightly linked genes on the same chromosome show very few recombinations because they are so close together that they tend to be inherited as a unit. This is consistent with Option D, which accurately describes the nature of tightly linked genes. Options A, B, and C do not correctly describe the behavior of linked genes.

NCERT Topic: Linkage and recombination

NCERT Line: "Tightly linked genes on the same chromosome showed very low recombination."

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About this NEET Practice Test

This test contains 10 MCQs on Linkage and Recombination (NCERT) with detailed solutions for each question. It is part of the Biology Class 12 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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