BIS 2B Lecture 9: BIS 2B BIO LECTURE 9

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fuchsiawhale832

16 Oct 2018

School

UC-Davis

Department

Biological Sciences

Course

BIS 2B

Professor

Mark Schwartz; Sharon Strauss

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BIS 2B Lecture Notes - Lecture 8: Exponential Growth, Selective Breeding, Catastrophism

BIS 2B Lecture 9: BIS 2B BIO LECTURE 9

BIS 2B Lecture Notes - Lecture 10: Punnett Square, Mendelian Inheritance, Gamete

Document Summary

In order for natural selection to drive evolution: Individuals must reproduce to form the next generation. We need to have multiple generations of organisms. Individuals within a population must vary in phenotype. Must vary in phenotype in order for natural selection to be able to act on it. Individuals must pass on at least some of their traits to their offspring (inheritance) If there was no heritability of traits, it would not result in differential genes for the next generation. Individuals with different traits have differential survival or reproductive success during the struggle for existence. Traits that are heritable and that enhance survival and/or reproduction relative to other members of the population will increase in frequency from generation-to-generation, so long as a particular selective regime persists. An adaptation (noun) is a trait that increase an organism"s survival or reproductive success.

Related Questions

1. Traits don't necessarily have to be passed on from parent to offspring for natural selection to act on them; traits that are environmentally acquired during the life time of an individual (such as practicing to become very strong or very fast) can also be acted upon by natural selection. Select one: True or False

2.Within the same species and even within the same population, not all individuals are the same. They vary in size, shape or other traits.

Select one:

True

False

3.Differential reproductive success means that some individuals in a population leave more offspring that survive and reproduce relative to other individuals in a population.

Select one:

True

False

coraldolphin670

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

Community Ecology

6. Competition between species is called ____________ competition. A. interspecific
B. exploitative
C. interference

D. fundamental E. intraspecific

7. A species that plays a critical role in maintaining the structure of an ecological community and helps to determine the types and numbers of various other species in the community is known as
A. a predator.

B. a keystone species. C. the primary species. D. the dominant species. E. the alpha species.

Evolution

1. We build trees because:
A. Organisms are related like members of a family are related.
B. Each lineage has a common ancestor that gave rise to that lineage. C. Characteristics are passed on from parents to offspring.
D. all of the above

2. Evolution basically denotes change in populations to: A. Improve reproductive success.
B. Remove defective individuals.
C. Increase the survival of the most fit individuals.

D. Discover better genes.

3. We can put species into groups based on shared: A. genes.
B. characteristics.
C. ecology.

D. environment.

4. Bats and birds share a common characteristic like having four limbs- homologies- with: A. Amphibians
B. Rodents.
C. Reptiles.

D. all of the above.

5. Which of these are mechanisms of evolution? A. Mutation
B. Migration
C. Gene flow

D. all of the above

6. Natural selection involves the following: A. Variation in traits
B. Differential reproduction
C. Hereditary

D. all of the above

BIS 2B Lecture 9: BIS 2B BIO LECTURE 9

BIS 2B Lecture Notes - Lecture 8: Exponential Growth, Selective Breeding, Catastrophism

BIS 2B Lecture 9: BIS 2B BIO LECTURE 9

BIS 2B Lecture Notes - Lecture 10: Punnett Square, Mendelian Inheritance, Gamete

Document Summary

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