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Statement I : Primary gene pool consists of cultivated species and landraces.
Statement II : The secondary gene pool consists of the progenitor species that are crossable with reduced fertility of the
resulting hybrids and progenies
Statement I : ll-The tertiary gene pool consists of all the species that are crossable with cultivated species
EXPLANATION
PGR Exploration, Conservation & International
- Harlan and de Wet's Gene Pool Concept (1971):
- Statement I is Correct: The Primary Gene Pool ($GP-1$) encompasses the cultivated species, primitive landraces, and freely crossable wild/weedy conspecific taxa. Crosses produce vigorous, completely fertile hybrids with normal chromosome pairing and gene recombination.
- Statement II is Correct: The Secondary Gene Pool ($GP-2$) consists of related, co-generic species that can cross with cultivated species to produce hybrids; however, hybrids typically exhibit reduced fertility, chromosome structural differences, and partial meiotic sterility.
- Statement III is Incorrect: The Tertiary Gene Pool ($GP-3$) consists of distant wild species where conventional crossing produces lethal, non-viable, or completely sterile hybrids. Gene transfer is not naturally crossable and requires advanced biotechnological intervention (such as embryo rescue, tissue culture, bridging species, or somatic protoplast fusion).
- Conclusion: Statements I and II are correct, Statement III is incorrect (Option 2).
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