Gene flow is an evolutionary factor associated with: a. artificial selection b.

Question

Gene flow is an evolutionary factor associated with: a. artificial selection b. random mating c. increased mutations d. migration of individuals e. small populations Evolution occurs in a. gametes. b. somatic cells. c. individuals. d. organelles. e. populations. English moths originally had a normal (bell-curve) distribution phenotypes. What was the result of the smoke and soot from the industrial revolution on those English moths? a. All phenotypes in the original population were reduced as the population declined. b. Both extremes of the curve were selected against and the curve became narrow and tall. c. Heterozygote individuals were weaker and died off. d. The entire population of moths became darker but retained the bell-shaped curve. e. The moth population went extinct. Natural selection acts on a. gametes. b. somatic cells. c. individuals. d. organelles. e. populations. Theodosius Dobzhansky once stated: "Nothing in biology makes sense except in the light of evolution." Support for this statement is provided by: a. genetics b. molecular biology c. physiology (e.g. photosynthesis and respiration) d. ecology e. all of the preceding The ultimate source of all genetic variation is: a. mutations b. crossing over c. meiosis d. polyploidy Without extensive medical intervention (high-tech equipment in modern hospitals) it is unusual for human babies weighing under 3 pounds or over 13 pounds to be born alive and survive (along with their mothers). This is an example of? a. natural selection b. survival of the fittest c. genetic drift d gene flow e geographic variation

Explanation / Answer

8 Migration of individuals

   Gene flow in important in transfer of genetic variation of one individual to other and this can be enhanced by migration of individual to other places.

9 Population

   Population is collection of individual within a species with collective gene pool and this gene pool will evolve and allows natural selection of fit individuals.

10 The entire population of moth became darker but retained the bell-shaped curve

     During industrial revolution the entire moth population became dark in color which created camouflage preventing them predation as they were easily mixed with smoke color and industrial pollution subsided they retain they light color

11 Gametes

   Natural selection acts on gametes responsible for producing mutations and making naturally fit.

12 The statement supported all branches of sciences late on discoveries showed it was helpful in every branch of science

13 Mutations

Random mutations are ultimate source of genetic variation Genetic recombination also produces changes within alleles.

14 Natural Selection.

Organisms tend to acclimatize the environment live better her the babies are made to acclimatize with modern techniques which increase natural selection

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