What specific reproductive isolation mechanism is being described by each following statements DescriptionExampleMechanismPrezygotic Isolation MechanismsClosely related species livein different places orenvironments, preventingthem from coming incontact with each other.As its name implies, the Lake Taal sea snake(Hydrophis semperi) is endemic (native) to LakeTaal and is found nowhere else in the world. Thisunique habitat keeps it isolated from closely relatedspecies of Hydrophis and prevents possibleinterbreeding.Drosophilapseudoobscura, two closely related fruit fly speciesin Hawaii, breed at different times of the day. D.persimilis breeds in early morning, while D.pseudoobscura breeds in the afternoon.Habitat isolation(a.k.a. geographic orecological isolation)Closely related speciesbecome sexually active ormature at different periods.This difference in breedingperiods or breeding seasonskeeps them fromencountering each other.Some species use complexcourting or mating rituals to performing complicated mating dances which varyattract mates. Interbreedingis prevented because evenclosely related species mayuse different rituals.persimilisandDrosophilaTemporalisolation(a.k.a. seasonalisolation)Many birds (usually the males) attract mates byBehavioralfrom species to species. Slight changes or mistakes(which may indicate inexperience, weakness, orhesitancy) in the dance may prevent even birds ofthe same species from mating.Amongindividualscannot mate with individuals having left-coiling(sinistral) shells anddifference in the position of the reproductiveorgans). Sinistral snails are very rare and themating of twoautomatically produce sinistral offspring.Although sea urchin species StrongylocentrotusfranciscanusStrongylocentrotus purpuratus (purple urchin)share the same habitat, they do not interbreedbecause their gametes do not recognize each other.So even when released at the same time into theisolationgarden(Cornuwith right-coiling (dextral) shellsDifferences orsnailsaspersum),incompatibility instructures, especially thoseinvolved in reproduction,prevent closely relatedspecies from interbreeding.Mechanicalisolationvice-versa (due to thesinistralparentsdoesnotChemical incompatibilitybetween the egg and thesperm of closely relatedspecies prevent thesegametes from uniting toform a zygote.(giantredurchin)andGametic isolationocean,gametesof S. franciscanusandS.purpuratus will not fuse to form a zygote.Postzygotic Isolation MechanismsMating between Drosophila melanogaster andDrosophila simulans (two fruit fly species that lookvery much alike) results in inviable hybrids due tothe parents' incompatible genes for nuclear poreproteins.Although a hybrid zygoteforms, it does not haveenough genetic material tocarry it beyond the earlystages of development. Itmight reach the embryostage, but eventually diesbefore birth.The hybrid offspring mayreach adulthood, but thedifference in thechromosomes of its parentscauses it to become sterileHybrid inviabilityHybrid infertility(a.k.a. hybridsterility)In 1962, the mating of a zebra (whose chromosomenumber is 44) and a donkey (whose chromosomenumber is 62) in Manila Zoo led to the birth of theworld's first zebronkey (withnumber of 53), whom the zoo personnel namedachromosome(due to defectivereproductive organs orfailure of germ cells toundergo meiosis).The first-generation ofhybrid offspring are viableand fertile, but the second-generation hybrids mayhave conditions(aberrations, infertility) thatprevent them from gettingestablished in thepopulation.Lolita. Due to the incompatibility of thechromosomes of its parents (resulting to thehybrid's inability to produce viable gametes), azebronkey is sterile.Some varieties of domestic rice (genus Oryza),when hybridized, produce first-generation hybridsthat are healthy and fertile. The second-generationhybrids (offspring of the first-generation hybrids),however, are stunted and sterile.Hybridbreakdown A) Most ligers (offspring of a male lion and a tigress) and tigons (offspringof a male tiger and a lioness) are sterile.B) The two races of maggot flies breed in the fruits of two different trees.Hawthorn maggot flies breed in the fruits of the hawthorn tree, while apple maggot flies breed in apples.C) Red-legged frogs (Rana draytonii) breed from around November to lateApril, while yellow-legged frogs (Rana boylii) breed from around late April to June.D) The structure of bucket orchid (genus Coryanthes) flowers allowspollination only by a certain species of orchid bees (tribe Euglossini).E) Offspring of hybrid cotton (genus Gossypium) plants either die duringearly development or grow into unhealthy plants.

Reproductive isolation mechanism The mechanisms are a set of evolutionary mechanisms, behavioral,…

Answered: A) Most ligers (offspring of a male…

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...