Which one of the following information can NOT be obtained from a 'progeny test' ?
Show Hint
- Breeding behavior of the plant.
- The target trait is heritable or not.
- The real value (genetic worth) of the plant.
- Recombination frequency and map distance between the target loci in the plant.
The Correct Option is D
Solution and Explanation
A progeny test is a plant breeding procedure where the genetic makeup and breeding value of a parent plant are evaluated by observing the performance of its offspring.
It helps breeders differentiate between phenotypic variations caused by genetics and those caused by environmental factors.
Step 2: Detailed Explanation:
Let us analyze what information can be obtained from a progeny test:
- Breeding behavior (A): By observing the offspring, breeders can determine if the parent is homozygous (producing uniform offspring) or heterozygous (producing segregating offspring) for a trait.
- Trait Heritability (B): Comparing parent and offspring phenotypes helps estimate heritability, showing how effectively a trait is passed to the next generation.
- Genetic worth (C): It evaluates the parent's actual breeding value based on offspring performance, which is essential for breeding programs.
- Linkage and Mapping (D): Recombination frequency and map distance cannot be determined from a standard progeny test.
Calculating genetic linkage and map distance requires analyzing segregation ratios (such as dihybrid F${}_2$ or testcross progeny) for two or more specific marker loci.
This requires crossing, tracking recombinant phenotypes, and performing statistical linkage calculations, which goes beyond the scope of a standard progeny test.
Step 3: Final Answer:
Recombination frequency and map distance cannot be obtained from a progeny test, which corresponds to option (D).
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