Question

Which situation is not an example of a prezygotic barrier? a. Two species of turtles breed at different times of the year. b. Two species of flowers attract different pollinators. c. Two species of birds display different mating dances. d. Two species of insects produce infertile offspring.

Short answer

Option (d) is the right answer because it states that two kinds of insects generate sterile progeny.'

Step-by-step solution

Introduction

Prezygoticisolationisatypeofreproductiveisolationmechanismthatpreventsgeneticinformationfrombeingsharedbetweenindividualsofrelatedspecies.

By blocking hybrid zygote development, it causes reproductive isolation.

Methods of prezygotic separation include mechanical isolation, ecological isolation, behavioural isolation, and temporal isolation.

Explanation for correct option

Option(d)isdescribedastwobugspeciesproducingsterileoffspring.

Hybridzygoteproductionispreventedbyprezygoticisolativemechanisms,whichsuggestisolationbeforezygoteformation.

Hybridsterilitycanbeseenintheformationanddevelopmentofaninfertileprogeny.

It's a postzygotic isolation technique.

As a result, that is the correct response.

Explanation for incorrect option

Option (a) becausetwoturtlespeciesreproduceatdifferentperiodsoftheyear.

Temporalisolationoccurswhenmembersofrelatedspeciesbreedatdifferentperiods.

Itisaprezygoticisolationapproachthatinhibitshybridzygotedevelopment.

Asaresult,it'sthewrongchoice.

Option(b)isrepresentedbytwoflowerspeciesthatattractdistinctpollinators.

Mechanicalisolationoccurswhenmembersofcloselyrelatedflowerspeciesattractdistinctpollinatorsduetodifferencesinappearance.

Itisaprezygoticisolationapproachthatinhibitshybridzygotedevelopment.

Asaresult,it'sthewrongchoice.

Option (c) because twospeciesofbirdshavedifferentmatingdances.

Behavioralisolationoccurswhenmembersofrelatedspeciesexhibitdivergentmatingandcourtshipbehaviour.

It is a prezygotic isolation approach that inhibits hybrid zygote development.

As a result, it's the wrong choice.