Correct option is B
Ans. (b) hybridization, back crossing and stabilization
Introgression refers to the transfer of genetic material from one species to another through repeated back-crossing and hybridization. The process begins with hybridization between two distinct species or populations, followed by back crossing where the hybrid individuals mate with one of the parent species. This process results in the transfer of alleles from one species to another. Finally, stabilization occurs when the genetic material from the hybrid successfully integrates into the gene pool of the recipient population, becoming stabilized over generations. This is the typical sequence that leads to introgression, where genes from one species persist in another's population.
Information Booster
Hybridization: The initial step in introgression is the hybridization between two genetically distinct populations or species. The resulting offspring (hybrids) carry genetic material from both parent species.
Back crossing: Back-crossing involves mating between the hybrid offspring and one of the parent species, which allows the introgressed genes to enter the population of the parent species. This step is crucial for the continuous flow of genetic material from one species to another.
Stabilization: Stabilization refers to the integration of the introgressed genes into the gene pool of the recipient population, where they are maintained over generations. Stabilization ensures that the introgressed alleles become part of the stable genetic makeup of the population.
Additional Information
Option (a): Only back crossing and hybridization are mentioned in this option, but it omits stabilization, which is a critical step in the introgression process. Thus, this option is incomplete.
Option (c): Stabilization followed by repeated hybridization is not the standard sequence for introgression. While repeated hybridization can occur, it is the back crossing that is necessary for the gene flow and stabilization of the introgressed genes.
Option (d): The inclusion of mutation in this sequence is incorrect, as mutation is not a defining event in the introgression process. While mutations can contribute to genetic diversity, they are not part of the introgression pathway, which primarily involves hybridization and back-crossing.
