Question 7 Which of the following suggests that sympatric speciation is occurring in Rhagoletis pomonella (the apple maggot fly)? The forms of the apple maggot fly are already true species that will not interbreed if placed in the same host environment. The sympatric races of the apple maggot fly are diverging, and potentially on the path to becoming separate species as evidenced by fruit preference documented in the maggots. Although the apple tree was introduced into North America about 400 years ago, the different races of the apple maggot fly have not evolved any adaptations that correspond to the different fruiting times of their hosts Although there are no genetic differences between isolated populations found in apple trees and downy hawthorn trees, there are significant behavioral differences between the groups. 1 pts
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Which of the following is true regarding speciation in Rhagoletis pomonella (the apple maggot fly)? Assortative mating by host plant is likely as they mate on or at their preferred host. The races of the apple maggot fly are potentially on the path to becoming separate species. The races of the apple maggot fly have diverged very recently within the last few hundred years. Host races of the apple maggot fly diverged in sympatry.
Madhur L.
Today, hawthorn and apple maggot flies are physically indistinguishable, however, they have different distinct genetic profiles. There is no geographic isolation or physical separation between the hawthorn and apple maggot flies. However, apple trees and hawthorn trees fruit ripen at different times. Hawthorn maggot flies strongly prefer to mate and lay fertilized eggs in hawthorn fruit, while apple maggot flies strongly prefer to mate and lay fertilized eggs in apple fruit. There is only a 4-6% rate that the two will mate to form a hybrid. The hybrids are viable and fertile. According to the biological species concept, are hawthorn and apple maggot flies separate species? Explain your answer.
Adi S.
Review the material on the possibility of sympatric speciation in Rhagoletis flies. What types of genotypic, phenotypic, or behavioral data would convince you that the two forms have become separate species?
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