BIOL10005 Lecture Notes - Lecture 32: Genetic Recombination, Elephant Seal, Exosphere

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orchidhare159

15 Aug 2018

School

University of Melbourne

Department

Biology

Course

BIOL10005

Professor

Dawn Gleeson

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Document Summary

Natural selection: (cid:862)i(cid:374) the struggle for sur(cid:448)i(cid:448)al, the fittest (cid:449)i(cid:374) out at the e(cid:454)pe(cid:374)se of their ri(cid:448)als (cid:271)e(cid:272)ause the(cid:455) su(cid:272)(cid:272)eed i(cid:374) adapti(cid:374)g the(cid:373)sel(cid:448)es (cid:271)est to their e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t(cid:863) survival of the fittest. Natural sele(cid:272)tio(cid:374): adapti(cid:448)e radiatio(cid:374) i(cid:374) (cid:271)eaks of dar(cid:449)i(cid:374)(cid:859)s fi(cid:374)(cid:272)hes: * different finches have different beak shapes this is related to their niche, and what kind of food they feed on e. g. seed cracking species = robust beaks, grub/insect eating species= thin and probing beak. * the medium ground finch that is found on the island of daphne major (a small island so entire population known and measured since 1973) * seed eating, with variation in beaks size (normal distribution like height in humans) * field observations show that beak size linked to type of deed eaten. Natural selection: beak size is heritable in geospiza fortis: * compare beak size of offspring with that of their parents. * 79% variation in offspri(cid:374)g (cid:271)eak size is predi(cid:272)ted (cid:271)(cid:455) pare(cid:374)ts(cid:859) (cid:271)eak size.

Related Questions

23.

Peter and Rosemary Grantâs research on Darwinâs finches demonstrated that dry years on the Galapagos Island Daphne Major favored deep beaks in the medium ground finch (Geospiza fortis) and that very wet years favored narrow beaks. In years that were neither wet nor dry (intermediate years), many different types of foods were available, and birds with intermediate beak sizes were favored. Immediately following an intermediate year, average beak size in G. fortis is expected to be

A) narrower than after a wet year and wider than after a dry year.

B) wider than after a wet year and narrower than after a dry year.

C) the same as after a wet year and wider than after a dry year.

D) the same as after a dry year and narrower than after a wet year.

13.

Select the evidence that would support the hypothesis that peppered moths and industrial melanism are an example of evolution by natural selection. Check all that apply.

A) Different color morphs exist naturally in the peppered moth population.

B) The genetic basis of melanism in peppered moths is unknown.

C) Dark moths are recaptured more in polluted areas than light moths.

D) Birds looking for food often miss moths that are the same color as the mothâs background.

Check all of the statements that are supported by studies of artificial selection.

A) Artificial selection shows that evolutionary change can occur over a short time.

B) Artificial selection shows that natural selection is capable of producing major evolutionary change.

C) Artificial selection occurs when humans selectively breed individuals of a species with desirable traits.

D) Artificial selection results only in minor changes within a species.

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BIOL10005 Lecture Notes - Lecture 32: Genetic Recombination, Elephant Seal, Exosphere

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