BIO 1130 Lecture Notes - Lecture 4: Hybrid Zone, Punctuated Equilibrium, Ecological Niche

18 views16 pages

greywallaby6

14 Oct 2017

School

Department

Course

Professor

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

cudapuca and 38677 others unlocked

BIO 1130 Full Course Notes

Verified Note

25 documents

Document Summary

A process in nature in which organisms possessing certain genotypic characteristics that make them better adapted to the environment tend to survive, reproduce, increase in frequency, and are thus able to pass on their genes to next generations. Key mechanism to evolution, which is the change in genetic composition of a population over time. Combination of population genetics and natural selection based on mendelian genetics. Embraced darwin"s theory of gradual change and de-emphasized the significance of mutations in genes that cause sudden drastic changes. Tried to link both levels of evolution [macroevolution results from accumulation of many microevolutionary changes] A group of organisms of one species that interbreed and live in the same place at the same time. The study of genetic influences on the components of cause and effect in the somatic characteristics of populations. Evolution involving small-scale changes (i. e. within species) occurring over a short-period of time that results in the formation of new subspecies.

Related Questions

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

Describe the theory of natural selection Which of thefollowing BEST describes the theory of natural selection? CHOOSEONE

	1 The genetic make-up of apopulation gradually changes from one generation to the next.
	2 Living organisms change overtime.
	3 Each species produces many moreoffspring than can survive long enough to reproduce. The offspringthat do survive contain genes that are inherited from theparents.
	4 There is variation among themembers of a species. Some of this variation is geneticallydetermined and so can be passed on to future generations.
	5 Some individuals have genes thatincrease their chances for survival and reproduction. Theseindividuals are more likely to reproduce and pass on their genes,causing their genes to become more common in the nextgeneration.
	6 There is a struggle for existenceamong the members of a population.

amberleopard326

The theory of natural selection has it that individuals withbetter genes tend to survive and reproduce, passing their genes totheir offspring. This gradual process results in a population moreadapted at survival. However, due to the advancement in medicalscience, humans with poorer genes tend to survive and reproducejust as well.

For example, in the past, many people, excluding those withnatural immunity due to some genetic mutations, would havesuccumbed to illnesses such as malaria and typhoid. But with betterhygiene and medical treatment, these patients tend to survive.

Now, imagine a future where all illnesses including cancer canbe treated. How would it impact the survival of the human race?Would we become more and more vulnerable such that our survivalhinges heavily on medical technology, analogous to how anastronaut's survival is dependent on his spacesuit?

BIO 1130 Lecture Notes - Lecture 4: Hybrid Zone, Punctuated Equilibrium, Ecological Niche

BIO 1130 Full Course Notes

Document Summary

Get access

Related textbook solutions

Molecular Cell Biology

Biology: Science for Life with Physiology

Concepts of Biology

Biology

Essentials of Biology

Related Documents

BIO 1130 Lecture Notes - Lecture 3: Gene Duplication, Valine, Fusion Gene

BIO 1130 Lecture Notes - Lecture 4: Pea, Allele Frequency, Genotype Frequency

BIO 1130 Lecture Notes - Missense Mutation, Nondisjunction, Polyploid

Related Questions