BIOL 1070 Lecture : unit 2

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taupellama890

18 Jan 2012

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Abundance- # of individuals of a particular species in an area. Genetic variation- differences at he dna level among individuals within a population. Primary source of genetic variation is mutation, can also result from recombination. Natural selection- non-random differences in survival and/ or reproduction among individuals entities on the basis of differences in heritable characteristics. Population bottle neck-sudden, severe reduction in population size, loss of individuals not related to particular traits (happens at random), founder effects- start a new population; random changes in allele frequencies in. Gene flow- movement of genes among populations, causes the frequency to become more alike 50/50; same allele frequency; sharing of alleles amoung populations.

Related Questions

Which of the following best describes the principle of evolution by natural selection?

A. Individuals within a population are genetically identical and natural selection occurs randomly

B. Individuals within a population exhibit genetic variation and those that are best adapted to their environment survive

C. Individuals within a population exhibit genetic variation and those that are least adapted to their environment survive

D. Individuals within a population undergo genetic mutation and natural selection occurs randomly

E. Individuals within a population exhibit genetic variation and natural selection occurs randomly

1. How do bacteria acquire genetic variation and how does thatdiffer from the mechanism by which humans acquire variation?

2. Be able to explain why the following statement is true:Natural Selection works on individuals while evolution works onpopulations over generations. Or to put it another way: Individualsdo not evolve, populations do.

3. How can evolution explain the formation of complex structuressuch as the eye or the flagella motor?

4. What causes variation in a species? To put this another way:all humans have the same genes, yet we do not look alike. What isthe reason for the phenotypic differences between individuals ofthe same species? What is genetic recombination?

lavenderbadger893

Genetic drift as an evolutionary factor is

(2pts)

responsible for the selection of mutations

greater in population with small numbers than in a population with large numbers

greater in population with much genetic variation than in a population with little genetic variation

connected to the movements of alleles between populations of single species

proportional to the size of a population. The larger the population the greater the force.

raspberrytortoise897

BIOL 1070 Lecture : unit 2

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