BIO120H1 Lecture Notes - Lecture 12: Genetic Drift, Natural Selection, Cloning

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Each individual will have very speciic combinaion of genes that will never occur in that combinaion again (unique alleles) Comparaive involves studying large number of species in order to get beter results as opposed to just studying one species. Can get evoluionary change by geneic drit, but this won"t give you speciaion. Natural selecion is driving force of biodiversity, only force that can cause biodiversity. Some species lose geneic diversity and cannot adapt to their environment and will not prosper in future generaions. Darwinian itness: how many genes will this give to the next generaion and will these genes help increase itness. The one concept that embraces all of life is evoluion. Can"t explain funcion and process of animals without evoluion. Theory is body of knowledge that is known to be true, not a hypothesis (theory of evoluion) Macroevoluion-ex. how diferent trees are related to one another.

Related Questions

Asexual reproduction: the first step to extinction
When species become asexual they could be taking the first stepto
extinction, say researchers who have been studying the geneticstructure
of Penicillium marneffei, an asexual fungus only found in parts ofsouthÂ
east Asia. Their research found that although P. marneffei sporeswere
able to spread over large distances on currents of air, they werenot able
to âinvadeâ the new environments in which they landed.
âWe believe the failure of P. marneffei to adapt to newenvironments is
because the fungus has largely dispensed with sexualreproduction.
Without sex, you will not have the mixing of genes it causes,something
all organisms need in order to be able to adapt to newenvironmentsâ, said
a member of the research team. Evolutionary theory predicts thatwhile
asexual organisms can initially prosper and out-compete theirsexual
cousins, they pay a price for being unable to adapt throughthe
recombination of genes caused by sexual reproduction.
DNA typing was used to show that different clones of the fungusare
found in different environments, and the researchers believe thatthe
adaptation of the fungus to these environments is limiting theirability to
adapt to other areas. They believe this is why P. marneffei isonly
endemic to a relatively small area of south-east Asia. Even thoughthe
6_________________________________________________________________
fungus makes spores which can spread over very large distances,the
researchers found that all the samples from any given locationwere
genetically very similar. This led them to the conclusion that thefungus
becomes highly adapted to its local environment, making ithighly
successful there, but stopping it spreading to other areas.
âBy being asexual, P. marneffei is not only limiting its ability toadapt, it
may be at risk of becoming extinct. If it is unable to adapt tonew
environments, it will be unable to adapt to changes in itscurrent
environment. While becoming asexual may provide short term
advantages to a species, in the long term, they are likely to endup in
evolutionâs ultimate dustbin â extinctionâ, concluded a member ofthe
research team

You should introduce your article by very briefly explaining thepurpose of
biological reproduction and touching upon the strategies used toachieve it, then
write your account using the following list as a guide to thepoints you should
discuss in your answer:
? How does asexual reproduction differ from sexual reproduction interms of
the biological processes involved and the genetic diversity andvariation of
the DNA produced?
What are the advantages and disadvantages of asexual andsexual
reproduction?
In terms of survival and adaptation, which reproduction strategy ismore
likely to allow a species to evolve rapidly (or to become extinct)?In your
answer briefly describe the two main mechanisms used to creategenetic
variation. Also, explain the factors and pressures that are likelyto drive the
process of adaptation.

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BIO120H1 Lecture Notes - Lecture 12: Genetic Drift, Natural Selection, Cloning

BIO120H1 Full Course Notes

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