analogous and homologous/MCAT Q: Evolution

[DieselPetrolGrl]

What is the difference between analogous and homologous ..features I guess?
I hate evolution bah ? anyone know what we really have to know except hardy and Darwinian beliefs?

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[VPDcurt]

analogous structures = serve the same function in two different species but not due to common ancestry... Like the flagellum of human sperm and the flagellum of a bacterium.

homologous structures = physical features shared by two different species because of a common ancestor...like the birds wing (5 bony supports), human hands, and dogs paws.

 

[VPDcurt]

I would also know Order, Family, Genus and Species in that order - those Qs come up every now and then in terms of which one shows the stronger relationship.

 

[DieselPetrolGrl]

double thanks!
i know all bout why KingPhilCameOverFo'GoodSoup 🙂

 

[MeowMix]

the only other evo topic, which I would go and look up now, if I were you, is R and K selection and being able to say which of the two is favored under conditions of minimal food, identify which species in an example is demonstrating R or K, etc.

then put your books away and relax!

 

[Scubadoc]

the only other evo topic, which I would go and look up now, if I were you, is R and K selection and being able to say which of the two is favored under conditions of minimal food, identify which species in an example is demonstrating R or K, etc.

then put your books away and relax!

R and K selection? what the heck is that?

i have *got* to stay away from these threads on SDN b/c it's just making me feel like i have forgotten everything.........wah.............

 

[GBFKicks]

R and K selection? what the heck is that?

i have *got* to stay away from these threads on SDN b/c it's just making me feel like i have forgotten everything.........wah.............

Basically in K selection there is less offspring and the parents take care of the offspring for a longer time (I remember 'parents take "K"are for longer')

R there are many offspring that tend to be independent.

In reality, K and R are relative... "one species is K selected compared to another," but in general it is fairly easy to determine which species are K and which are R if you look at the offspring quantity and parental care.

 

[Scubadoc]

right on! thanks a mill 👍

 

[YML]

King Philip Came Over For Good Sex
kingdome, phylum, class, order, family, genus, species