(H) A hybrid zone between two species of butterflies contains individuals with widely varying genotypes, ranging from those matching both parental species to those with varying proportions of genes from the parental species. From this information one can infer that…Group of answer choicesthe hybrid zone is relatively newthe hybrid zone is relatively oldprezygotic isolating mechanisms are maintaining the hybrid zoneadaptive radiation is maintaining the hybrid zonethe hybrid zone has been reinforced
Question
(H) A hybrid zone between two species of butterflies contains individuals with widely varying genotypes, ranging from those matching both parental species to those with varying proportions of genes from the parental species. From this information one can infer that…Group of answer choicesthe hybrid zone is relatively newthe hybrid zone is relatively oldprezygotic isolating mechanisms are maintaining the hybrid zoneadaptive radiation is maintaining the hybrid zonethe hybrid zone has been reinforced
Solution
The information given suggests that the hybrid zone is relatively old. This is because the presence of individuals with a wide range of genotypes, from those matching both parental species to those with varying proportions of genes from the parental species, indicates that there has been sufficient time for recombination and independent assortment to produce this genetic variation.
If the hybrid zone was new, we would expect to see less genetic variation as there would have been less time for recombination and independent assortment to occur.
Prezygotic isolating mechanisms and adaptive radiation are not necessarily indicated by the information given. Prezygotic isolating mechanisms would prevent hybridization from occurring in the first place, and adaptive radiation would result in the formation of many new species, not a hybrid zone.
Reinforcement of the hybrid zone would lead to an increase in the reproductive isolation between the two species, which is not suggested by the information given.
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