BIO120H1 Lecture Notes - Philippine Standard Time, Genetic Drift, Potentilla

103 views5 pages

lemonzebra508

11 Dec 2010

School

Department

Course

Professor

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

shdhhfhshhpla3806 and 40102 others unlocked

BIO120H1 Full Course Notes

Verified Note

36 documents

Document Summary

Key concepts/ terms: genetic differentiation, geographical variation, population, phenotypic plasticity, migration, reciprocal transplant studies, gene flow, ecological race, population differentiation: gene flow, geographical variation, experimental studies of local adaptation: phenotypic plasticity, transplant studies. If there is no mating then there is no gene flow. Populations are frequently sub-divided into smaller units based on ecological or behaviour factors. For example, populations of fish in tide pools, trees in farmland woodlots, and insects on host plants, are sub- divided because suitable habitats are not continuous in distribution. In fact, a continuum exists between large populations with random mating and small sub-divided populations with localized inbreeding. The degree to which a population can be delimited from other populations depends on the level of gene flow between them. Migration can be thought of as the movement of individuals from one population into another, whereas gene flow refers to the movement of genes from one population into another.

Related Questions

-Describe the mechanism(s) by which inbreeding can lead to inbreeding depression.

-Compare and contrast the impacts of genetic drift and inbreeeding on genetic variation (heterozygosity, polymorphism, allelic richness). why does each have the stated impacts.

- Use an example ( real or made up) to describe the influence of gene flow on local adaptations and population differentiation.

1. Scientists found that different beak shapes lead to differentmating songs in Darwin's finches. This result best supports whichhypothesis?

	A. Darwin's finches are not different species according to theBiological Species Concept.
	B. Behavioral isolation in Darwin's finches is unrelated to beakshape.
	C. Adaptation to different food sources likely occurred afterreproductive isolation in Darwin's finches.
	D. Adaptation to different food sources indirectly led tobehavioral isolation in Darwin's finches.

2. Which of the following could occur if two partiallyreproductively isolated populations become sympatric? Check allthat apply.

	A. Gene flow between the populations will occur
	B. The populations may eventually become separate speciesthrough reinforcement
	C. The populations will continue to be partially reproductivelyisolated
	D. The populations may eventually lose their geneticdistinctiveness
	E. Hybrids will be inviable or infertile

3. In which population would the rate of genetic drift be thegreatest?

	A large population that is geographically isolated from itsparent population
	A small population that is geographically isolated from itsparent population
	A large population that is not completely geographicallyisolated from its parent population
	A small population that is not completely geographicallyisolated from its parent population

4. Indicate true or false that the following organisms would beconsidered separate species according to the biological speciesconcept. (T/F)

1. Lions and tigers can interbreed successfully to produce viable,fertile offspring, but lions live in open grasslands and tigerslive in dense forests. (T/F)
2. Black bears in the United States can have coat colors rangingfrom blonde to jet black, but bears with different coat colorsoccupy the same habitat and interbreedsuccessfully. (T/F)
3. Many leopard frogs in the eastern United States look the sameand can mate to produce a fertilized egg, but the embryo does notdevelop past the early stages. (T/F)
4. Many of Darwin

cyanbuffalo931

Consider two plant populations that exist in different types ofhabitats, one relatively wet for most of the year, and the otherone dry, and each habitat selects for different traits. Plants inthe wet environment are selected for improved tolerance to floodingconditions while plants in the drying habitat select for traits thereduce water loss. If gene flow occurred between these populationsbut most of the gene flow was from the dry to the wet populationwhat is the most likely prediction?

		the population in the dry habitat will lose geneticvariation b)
		the population in the wet habitat will lose geneticvariation c)
		the population size in the dry habitat will be reduced d)
		the ability of the population in the wet environment to adapt tothe wet conditions would be reduced.

viridianimpala122

BIO120H1 Lecture Notes - Philippine Standard Time, Genetic Drift, Potentilla

BIO120H1 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

BIO120H1 Lecture Notes - Lecture 7: Human Genetic Variation, Phenotypic Plasticity, Genetic Drift

BIO120H1 Lecture 7: Lecture Seven: Population Structure, Gene Flow and Genetic Drift

BIO120H1 Lecture Notes - Lecture 7: Genetic Drift, Founder Effect, Phenotypic Plasticity

Related Questions