Question:
Statement (A) : The resolution of genetic map depends on the number of crossovers which have been scored.
Statement (B) : Genetic maps have limited accuracy as the recombination are more likely to occur at some points than at others.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (A) : The resolution of genetic map depends on the number of crossovers which have been scored.
Statement (B) : Genetic maps have limited accuracy as the recombination are more likely to occur at some points than at others.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (B) : Genetic maps have limited accuracy as the recombination are more likely to occur at some points than at others.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
A genetic distance of $1\text{ cM}$ is defined as a $1\%$ chance of recombination.
Because recombination rates vary, $1\text{ cM}$ can represent hundreds of thousands of base pairs in some chromosomal regions, but millions of base pairs in others, such as near the centromere.
Because recombination rates vary, $1\text{ cM}$ can represent hundreds of thousands of base pairs in some chromosomal regions, but millions of base pairs in others, such as near the centromere.
Updated On: Jul 23, 2026
- Both (A) and (B) are correct.
- Both (A) and (B) are incorrect.
- Only (A) is correct, (B) is not correct.
- Only (B) is correct, (A) is not correct.
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Genetic mapping determines the relative positions of and distances between genes on a chromosome based on recombination frequencies.
The accuracy and resolution of these maps depend on both statistical sample size and biological variations in recombination rates across different regions of the genome.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
Statement (A) is correct because the resolution of a genetic map is determined by the frequency of recombination events observed.
To resolve two genes that are located very close together, a large number of offspring must be screened to detect rare crossover events between them.
If the sample size is too small, no crossovers will be observed, and the genes will appear completely linked.
Therefore, scoring more crossovers increases the resolution of the genetic map.
Statement (B) is correct because recombination is not uniform across chromosomes.
Certain genomic regions, known as recombination hotspots, exhibit significantly higher rates of crossing over.
Conversely, regions near the centromere or heterochromatin are recombination coldspots where crossing over is suppressed.
Because of this variation, genetic distance (measured in centimorgans, cM) does not map linearly to physical distance (measured in base pairs, bp), which limits the physical accuracy of genetic maps.
Both statements are correct.
Step 3: Final Answer:
Both Statement (A) and Statement (B) are correct.
This corresponds to Option (A).
Genetic mapping determines the relative positions of and distances between genes on a chromosome based on recombination frequencies.
The accuracy and resolution of these maps depend on both statistical sample size and biological variations in recombination rates across different regions of the genome.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
Statement (A) is correct because the resolution of a genetic map is determined by the frequency of recombination events observed.
To resolve two genes that are located very close together, a large number of offspring must be screened to detect rare crossover events between them.
If the sample size is too small, no crossovers will be observed, and the genes will appear completely linked.
Therefore, scoring more crossovers increases the resolution of the genetic map.
Statement (B) is correct because recombination is not uniform across chromosomes.
Certain genomic regions, known as recombination hotspots, exhibit significantly higher rates of crossing over.
Conversely, regions near the centromere or heterochromatin are recombination coldspots where crossing over is suppressed.
Because of this variation, genetic distance (measured in centimorgans, cM) does not map linearly to physical distance (measured in base pairs, bp), which limits the physical accuracy of genetic maps.
Both statements are correct.
Step 3: Final Answer:
Both Statement (A) and Statement (B) are correct.
This corresponds to Option (A).
Was this answer helpful?
0
0
Top ICAR AIEEA Plant Biotechnology Questions
- Which of the following molecules can be classified under glycosphingolipid category?
- The bicarbonate buffer is a principal buffering system in blood plasma. The ratio of the bicarbonate to carbonic acid required to maintain pH of plasma at 7.4 is:
- Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): The disruption of $\beta$-oxidation of fatty acids in plants can potentially reduce stress-induced ROS accumulation and improve its stress tolerance.
Reason (R): In plants, $\beta$-oxidation of fatty acids takes place predominantly in peroxisomes, where first enzyme of $\beta$-oxidation viz. fatty acyl CoA oxidase produces large amounts of hydrogen peroxide.
In light of the above statements, choose the correct answer from the options given below. - The serum level of which of the following metabolites can effectively distinguish "Vitamin B12 deficiency" from "Folate deficiency" ?
- Match List-I with List-II
List-I (Name of the Enzyme) & List-II (Class of the enzyme)
(A). Pyruvate carboxylase & (I). Oxidoreductase
(B). Fumarase & (II). Hydrolase
(C). Phospholipase & (III). Lyase
(D). Nitrogenase & (IV). Ligase
Choose the correct answer from the options given below:
View More Questions
Top ICAR AIEEA Cytogenetics Questions
- The type of chromosome in which the centromere is located at the end of the chromosome is known as
- Which of the following cell organelle has connection with male sterility
- Haploids when treated with colchicine results in
- Identify the wrong statement about meiosis
- Bacterial conjugation can lead to gain of new alleles in recipient cell
Statement I: Through involving crossing over between DNA fragment of donor and recipient cell
Statement II: Through gain of plasmid from donor bacterium to recipient bacterium
In light of the above statements, choose the correct answer from the options given below:
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions