8. Gene flow is an evolutionary factor associated with: a. artificial selection
ID: 83045 • Letter: 8
Question
8. Gene flow is an evolutionary factor associated with: a. artificial selection b. random mating c. ncreased mutations d. migration of individuals e. small populations 9. Evolution occurs in a. gametes b. Somatic cells. c. individuals d. organelles. e. populations. 10. 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 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. The moth population went extinct. 11. Natural selection acts on a. gametes. b. somatic cells. c. individuals. d. organelles e. populations 12 Theodosius Dobzhansky once stated: "Nothing in biology makes sense except in the light ofevolution." Support for this statement is provided by: a. genetics b. molecular biology c. physiology (e.g. photosynthesis and respiration)Explanation / Answer
8. d.
With the migration of individuals there is migration of genes. Due to this gene flow is linked to migration.
9. e.
Evolution occurs in a population due to gene pool which is the collection of entire population's genes. When changes occur in the gene pool then population is affected and evolves.
10. a.
The soot on the trees caused light colored moths to become easy prey. Hence, the phenotype reduced and darker phenotype became more dominant. But as time passed light colored moths again gained dominance.
11. a.
Gametes are the reason for genetic variation and natural selection works on these variations. If we consider the case of all individuals being similar in genetic makeup then selection could not take place.
12. a.
The concepts of evolution and natural selection have been explored with the science of genetics. Genetics helps in understanding biology in a detailed manner.
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