BIOL208 Lecture 5: Lecture 5

29 views3 pages

cyanwalrus955

10 Oct 2018

School

University of Alberta

Department

Biology (Biological Sciences)

Course

BIOL208

Professor

Audrey Reid

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Evolution process that change population of organism over time. Dar(cid:449)in"s theory of e(cid:448)olution: more offspring are produced each generation than the environment can support, there is variation in physical, physiological and behavioral traits among individuals in a population. Some of this variation is heritable (passed on to offspring: some traits will give some individuals an advantage over the other members of the population. Individuals who possess those traits will have a higher change of surviving and reproducing than the other members of the population, increasing their fitness. Fitness: the relative genetic contribution of individuals to future generations: traits that result in increased fitness will become more common within a population over subsequent generations. Characteristics are passed from parent to offspring in the form of discrete packets of information: passed down through genes, there are alternative form of genes=> alleles. Gene: discrete region/loci of dna; the molecular unit of heritability. Alleles: an alternate form of the same gene.

Related Questions

What set Darwin and Wallace's concept of natural selection apart from earlier ideas of evolution?

A) All of the above

B) Their concept suggested that life forms change over time, whereas earlier ones did not

C) Their concept included the idea that traits are passed on to offspring, whereas earlier ones did not

D) Their concept depended on a process by which differences in phenotypic traits cause some individuals to be more "fit" than others, depending on the environmental circumstances

Which statement about evolution by natural selection isfalse?

Natural selection allows organisms with higher fitness toreproduce more successfully.

Natural selection favors those traits that confer higherfitness in the environment.

Natural selection is a random change in characteristics of apopulation over generations.

Evolution by natural selection affects populations oforganisms, not individual organisms.

An organism's fitness depends on its _____.

ability to survive and reproduce

ability to swap genetic material with other organisms

physical size

ability to mutate

population

Consider the heavily armored stickleback fish population thatcolonized the lake. If all the individuals in that population weregenetically identical, what do you predict would happen when theycolonized the freshwater lake?

The population would increase, as it has increased foodresources.

The population would evolve through natural selection to bebetter adapted to its environment.

The population would decrease due to more juvenile fish beingeaten.

No answer text provided.

Which of the following are adaptations?

Thicker beaks on finches that allows them to eat large seeds,when large seeds are the most abundant.

Less armor on stickleback fish in freshwater that allows themto grow faster to avoid predation.

More armor on stickleback fish in the ocean that prevents themfrom being eaten by larger predators.

None of the above.

All of the above.

olivemink746

what is the differential success of individuals in a population in response to environmental conditions?

A (n) what is any heritable behavioral morphological or physiological trait of an organism that has evolved over a period of time by the process of natural selection.

what Is the mating of individuals in the population that are more closely related than expected by random chance?

A (n) what is a measurable gradual change over a geographic region in the average value of a trait?

What Mating occurs when individuals choose mates nonrandomly with respect to some phenotypic trait?

BIOL208 Lecture 5: Lecture 5

Document Summary

Get access

Related Documents

BIOL208 Lecture Notes - Lecture 5: Heritability, Meiosis, Phenotype

BIOL208 Lecture Notes - Lecture 5: Natural Selection, Allele Frequency, Rainbow Trout

BIOL208 Lecture Notes - Lecture 1: Medium Ground Finch, Darwin'S Finches, Genetic Drift

Related Questions