- Which one of the following options is an INCORRECT match?
Option-wise explanation
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F₂ population – “Selfing or sib‑mating F₁ hybrids”
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This is correct. F₂ is obtained by selfing or sib‑mating the F₁ hybrid.
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F₂ is a one‑time, segregating generation and is not considered immortal.
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F₂:₃ population – “Immortal population” – incorrect
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F₂:₃ families are produced by selfing individual F₂ plants and evaluating their F₃ progeny.
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These families are still segregating and cannot be regenerated identically once seed is exhausted, so they are not truly immortal mapping populations.
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This makes this match the wrong one.
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Backcross population – “Difference in segregation patterns of dominant and recessive markers”
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Backcross populations are indeed useful to analyze how dominant vs recessive markers segregate from a hybrid back to a parent; the description is acceptable as a characteristic use.
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F₁ doubled haploids – “Immortal population”
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Doubled haploids are fully homozygous lines derived from the F₁ and can be selfed indefinitely with no further segregation.
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They are correctly regarded as an immortal mapping population.
Hence, the incorrect match in the question is the F₂:₃ population being labeled as an immortal population.
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