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Following is the data of recombination f...

Following is the data of recombination frequency of a few gene pairs:
`{:(X&Y,30%), (P&Q,50%), (T&S,44%):}`
Mark the correct statements
l. Each of the above gane pairs must be located on hte same chromosome.
ll. Genes X & Y are closely placed than T & S.
lll. Recombinant frequency are indicative of actual physical distances between the genes.

A

l & ll

B

ll & lll

C

l & lll

D

only ll

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the recombination frequency of gene pairs and to determine the correctness of the given statements, we will analyze each statement based on the provided data. ### Step-by-Step Solution: 1. **Understanding Recombination Frequency**: - Recombination frequency is a measure of the likelihood that two genes will be separated during meiosis due to crossing over. It is expressed as a percentage, which reflects the physical distance between the genes on a chromosome. 2. **Analyzing the Given Data**: - The recombination frequencies provided are: - X & Y: 30% - P & Q: 50% - T & S: 44% - A higher recombination frequency indicates that the genes are further apart on the chromosome, while a lower frequency suggests they are closer together. 3. **Evaluating Statement I**: - Statement I: "Each of the above gene pairs must be located on the same chromosome." - **Analysis**: A recombination frequency of 50% indicates that P & Q could be on different chromosomes or far apart on the same chromosome. Therefore, this statement is incorrect. 4. **Evaluating Statement II**: - Statement II: "Genes X & Y are closely placed than T & S." - **Analysis**: The recombination frequency between X & Y is 30%, while that between T & S is 44%. Since 30% is less than 44%, this indicates that X & Y are closer together than T & S. Therefore, this statement is correct. 5. **Evaluating Statement III**: - Statement III: "Recombination frequencies are indicative of actual physical distances between the genes." - **Analysis**: Recombination frequencies provide an estimate of the distance between genes but do not represent actual physical distances due to factors like gene linkage and the presence of other genes. Thus, this statement is incorrect. 6. **Conclusion**: - The only correct statement is Statement II. Therefore, the correct answer to the question is that only Statement II is true. ### Final Answer: - **Only Statement II is correct**.
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