Evolution and Speciation

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46 Terms

1
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why is Lamark's theory not supported

acquired traits are not inherited and passed onto future generations

2
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why is Darwin's theory supported

variation is present in a population due to the presence of alleles

3
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what are acquired characteristics

they develop during the lifetime of an individual

4
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what are heritable characteristics

passed on from parent to offspring

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what type of characteristics does evolution concern

heritable characteristics

6
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what is the evidence for evolution

- DNA, RNA and protein sequences
- homologous structures
- selective breeding

7
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why does DNA, RNA, and protein provide strong evidence for evolution

- the same genes are present in organisms which have evolved from a common ancestor
- differences in the base sequences of DNA, RNA, and proteins are the result of mutations

8
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what is selective breeding

humans choosing plants or animals with desirable traits to breed together and produce offspring with more of the desirable traits

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what are homologous structures

have a similar structure but have a different function; come from a common ancestor

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what's an example of a homologous structure

wings of bats and birds, human arm, and flippers/fins

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what are analogous structures

have different structure but have a similar function; no common ancestor

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what's an example of an analogous sructure

bat wings + butterfly wings

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what is convergent evolution

the evolution of similar structures in species not related due to a recent common ancestor

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what type of structure is the result of convergent evolution

the wings of birds, bats, and insects

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what is speciation

the formation of new species through evolution

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what is reproductive isolation

occurs when there is a barrier which prevents individuals from reproducing

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what is the common ancestor of chimps and bonobos

apes

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how did the chimps and the bonobos become geographically isolated

the Congo river widened

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what are the three types of reproductive isolation

- allopatric
- sympatric
- behavioral

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what causes allopatric speciation

geographical isolation

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what is sympatric isolation

a population divides into different species while inhabiting the same habitat

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what are the 2 types of sympatric isolation

behavioural + temporal isolation

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what is behavioural isolation

individuals are reproductively isolated due to behaviour

24
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whats an example of behavioural isolation

mating behaviour in animals

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what is temporal isolation

organisms reproduce at different times

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what is biodiversity

the variety of organisms in an ecosystem

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what is adaptive radiation

the evolution of a single ancestral species into several species, as the ancestral species spread out and become adapted to new environmental niches

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adaptive radiation is what type of evolution

divergent evolution

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when does adaptive radiation occur

when a single species moves to and occupies a variety of different niches

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how did Darwin's finches show adaptive radiation

moved into the different niches available on the Galapagos Islands

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what is a hybrid

the offspring of two different species

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why are hybrids rare

the prezygotic/postzygotic barriers prevent the mixing of alleles between different species

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when do prezygotic barriers occur

before fertilization

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what are the four different types of prezygotic barriers to hybridization

- behavioural
- temporal
- ecological
- mechanical

35
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what is ecological isolation

species are in different habitats

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what is mechanical isolation

organisms physically can't mate

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when do postzygotic barriers occur

after fertilization, the offspring isn't fertile or viable

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what are the three types of postzygotic barriers

- hybrid inviability
- hybrid infertility
- hybrid breakdown

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what is hybrid inviability

development of offspring is not successful (or die early)

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what is hybrid infertility

hybrids are not fertile

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what is hybrid breakdown

offspring can reproduce, but the second generation is weak or sterile

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how many sets of chromosomes do haploids have

1 set

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how many sets of chromosomes do diploids have

2 sets

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how many sets of chromosomes do polyploids have

more than 2 sets

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why does polyploidy result in speciation

nondisjunction, an error occurring during myosis

46
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what types if polyploid plants are capable of reproducing

plants with an even number of sets of chromosomes as meiosis can occur with homologous pairs of chromosomes