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A set of genes will be in a complete li...

A set of genes will be in a complete linkage when the progeny phenotypes for parental (P) and recombinant (R ) types are :

A

P=0%,R=100%

B

P=50%,R=50%

C

`Plt50%,Rlt50%`

D

P=100%,R=0%

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To solve the question regarding the conditions for complete linkage of genes, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Complete Linkage**: - Complete linkage occurs when two or more genes are located very close to each other on the same chromosome. This proximity means that they are inherited together during meiosis, leading to specific patterns in the offspring. 2. **Identifying Parental and Recombinant Types**: - In genetic crosses, offspring can display parental phenotypes (those that resemble the parents) and recombinant phenotypes (those that are combinations of traits not found in the parents due to crossing over). 3. **Analyzing the Concept of Crossing Over**: - Crossing over is a process that occurs during meiosis where homologous chromosomes exchange segments. If crossing over occurs between linked genes, it can produce recombinant phenotypes. However, in complete linkage, crossing over does not occur. 4. **Determining Progeny Phenotypes**: - In the case of complete linkage, all offspring will exhibit parental phenotypes because the genes do not assort independently and there is no recombination. Therefore, the ratio of parental (P) to recombinant (R) phenotypes will be: - P = 100% (all offspring resemble the parents) - R = 0% (no recombinant offspring are produced) 5. **Selecting the Correct Option**: - Based on the above analysis, the correct answer to the question is that for a set of genes to be in complete linkage, the progeny phenotypes must be: - P = 100% and R = 0%. ### Final Answer: - The progeny phenotypes for parental (P) and recombinant (R) types in complete linkage are: - P = 100% and R = 0%.
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