The existence of biological barrier that impedes members of two species to produce viable offsprings is called as.. Mating conditions Reproductive isolation Gradualism
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QUESTION 11 For two species to remain separate, the key is reproductive isolation (lack of gene flow). There are numerous reasons why two species would not interbreed, and they are categorized into pre-zygotic and post-zygotic barriers. Imagine that the new species you created, and a closely-related species, do not successfully reproduce because they have different mating seasons. What kind of barrier is this? mechanical isolation, a type of pre-zygotic barrier temporal isolation, a type of pre-zygotic barrier gametic isolation, a type of pre-zygotic barrier hybrid sterility, a type of post-zygotic barrier QUESTION 12 Imagine that you're studying a small population of your imaginary animal species. Due to a random event (not natural selection), the allele frequencies in the population change. This is an example of microevolution caused by ___________, and we would say this population ________ at Hardy-Weinberg equilibrium. genetic drift, is not assortative mating, is gene flow, is not adaptation, is
Adi S.
Define prezygotic reproductive isolation - Genetic Isolation
Madhur L.
No matter what the mode of speciation is, speciation involves a reduction in gene flow. Eventually something must prevent individuals from the two populations from freely exchanging genetic information. As long as they can freely exchange genetic information than whatever genetic differences exist between them will disappear and speciation will not occur. See Reproductive Isolation for an explanation with examples. Often reproductive barriers are classified according to their timing relative to zygote formation. Basically you have Prezygotic and Postzygotic reproductive barriers. Comparing two different, but closely related species, you notice the following. Which may be prezygotic reproductive barriers (you can choose more than one)? a. Incompatibility in reproductive organs. b. Differences in timing of ovulation. c. Matings between members of the two different species produce infertile offspring. d. Differences in timing of birth (one gives birth in the spring, one in winter). e. Differences in mating calls.
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