Question

Penis length (mm) HH HH OH OH H1 S. largillierti S. eucosima Banta Benoki Sukuta Kanna Hedo Yona Mt. Hedo Genka Hentona Nuuha Janagusuku Shirahama Kouri The figure shows the penis length of two species of snails found in different locations in Japan. Sites where both populations are found (e.g., Yona, where the populations are sympatric) are indicated as two bars for that site. The pattern of variation in this trait between the populations illustrates o reproductive character displacement. O allopatric speciation. O a hybrid zone. O sympatric speciation.

Answer 1

Here, the pattern of variation in this trait between the population illustrates, reproductive character displacement,

when species veer in allopatry and come into optional contact, the common determination may support character disparity to encourage accomplice separation and abstain from the mating impedance. This procedure is called fortification, which normally brings about more noteworthy separation in mating-related attributes in territories of sympatry (conceptive character uprooting). Such examples are generally shown in premating signals, yet little is thought about how interspecific mating influences the morphological development of genitalia. Here, we present proof of regenerative character uprooting in genital morphology in two land snail types of the sort Satsuma. Morphometric investigations obviously uncovered more prominent sympatric divergences in the penis and lengths, paying little heed to the natural, hereditary, and geographic impacts. This is the first exhibition of regenerative character relocation in quite a while in a creature other than creepy crawlies and features the significance of breaking down recently disregarded genital morphologies in understanding the general instruments of prezygotic detachment in land snails.

Speciation happens when populaces amass hereditary contrasts that, upon optional contact, cause conceptive incompatibility. How qualities for conceptive contradictions (speciation qualities) could spread in a populace, be that as it may, has been just inadequately understood. Inland snails, moment speciation may happen once a populace gets fixed for left-right inversion by a solitary quality. Sexual intercourse between dextral (clockwise wound) and sinistral (counterclockwise looped) snails are typically firmly blocked by genital and social jumbles since they are switched in the genital situation on the body side just as in curling direction. The inversion is dictated by a maternal impact of a solitary atomic quality in at any rate four phylogenetically isolated groups of pulmonate snails. Along these lines, obsession for an inversion allele in an at first spatially disengaged populace could finish premating seclusion among dextral and sinistral populaces, offering to ascend to another species. Truth be told, left-right inversion has advanced ordinarily, particularly in earthly snails, Be that as it may, positive recurrence subordinate determination coming about because of challenges of mating with the dominant part looping phenotype is relied upon to dispose of the inferred phenotype with turned around chirality. Along these lines, as the two-locus model predicts, speciation brought about by a regenerative contradiction at a solitary locus should just once in a while continue, without either hereditary drift or common choice for the inversion that more than counterbalances the mating disadvantage. Thusly, the birthplaces of switched snails have been baffling.