Question 4 Describe how a single species can form new species. Answer - generic example all the key words – A population of species shows a great deal of variation √ If a population splits/divides into two or more populations by means of a physical barrier √ √. There is now no gene flow between the two populations. √ Since each population may be exposed to different environmental conditions√, Natural selection occurs independently each of the two populations √ √ in The desired traits that survive are different for the two or populations √ √ Over many generations the individuals of the two populations become very different from √ √ each other genotypically and phenotypically √. Even if the two populations were to mix again√, they will not be able to interbreed with each other, thus becoming different species√ / √ one or both of the populations becomes a new species QUESTION 5 5 Study the following set of drawings and answer the question that follows. Describe how the Proteus species in South Africa and Australia evolved in different species. (15) Memo 6.1 Allopatric speciation√ - There was genetic variation within the original proteus species population on Gondwana land - because of continental drift the proteus population from the main land separates into two groups - each of the proteus groups live on two different continents /South Africa and Australia - living under different environmental conditions The proteus species underwent natural selection independently on each continent - Only those proteus species with the favourable characteristic that was better suited/ on each specific continent survived - Continued natural selection over many generations - resulted in each continent having species that were very different genotypically and phenotypically from species of the other continent - These differences prevented them from interbreeding leading to the formation of new species on each continent [12] Question 7 Describe how the Baobabs trees in South Africa and Madagascar evolved in different species.
Question 4 Describe how a single species can form new species. Answer - generic example – all the key words A population of species shows a great deal of variation √ If a population splits/divides √ into two or more populations by means of a physical barrier √. There is now no gene flow √ between the two populations. Since each population may be exposed to different environmental conditions√, Natural selection √ occurs independently √ in each of the two populations The desired traits √ that survive √ are different for the two or populations Over many generations √ the individuals of the two populations become very different √ from each other genotypically and phenotypically √. Even if the two populations were to mix again√, they will not be able to interbreed √ with each other, thus becoming different species√ / one or both of the populations becomes a new species QUESTION 5 5 Study the following set of drawings and answer the question that follows. Describe how the Proteus species in South Africa and Australia evolved in different species. (15) Memo 6.1 Allopatric speciation√ - There was genetic variation within the original proteus species population on Gondwana land - because of continental drift the proteus population from the main land separates into two groups - each of the proteus groups live on two different continents /South Africa and Australia - living under different environmental conditions The proteus species underwent natural selection independently on each continent - Only those proteus species with the favourable characteristic that was better suited/ on each specific continent survived - Continued natural selection over many generations - resulted in each continent having species that were very different genotypically and phenotypically from species of the other continent - These differences prevented them from interbreeding leading to the formation of new species on each continent [12] Question 7 Describe how the Baobabs trees in South Africa and Madagascar evolved in different species.