Chapter Quiz


1	The term "jumping gene" refers to a gene or DNA fragment that moves to and disrupts the function of another gene.
		A)	True
		B)	False


2	In a DNA molecules the two sides of the "ladder" are composed of alternating ________.
		A)	thymine and cytosine
		B)	adenine and guanine
		C)	purine and pyrimidine
		D)	phosphate groups and sugar


3	Complex organisms, such as oak trees and humans, have fewer genes than simple organisms because years of evolutionary mutations removed unnecessary genes.
		A)	True
		B)	False


4	DNA polymerase
		A)	is an enzyme used in semi-conservative DNA replication.
		B)	is responsible for somatic mutations.
		C)	is an enzyme used in translation.
		D)	all of the above.


5	Which of the following does not use the polymerase chain reaction?
		A)	fetal testing
		B)	food safety
		C)	dung genetics
		D)	none of the above


6	Over 75% of genomic DNA of eukaryotic organisms contains genes; the remaining 25% is noncoding DNA.
		A)	True
		B)	False


7	Some toxic chemicals, ultraviolet light, and ionizing radiation can cause DNA replication errors and are therefore called _________.
		A)	germ-lines
		B)	mutagens
		C)	anticodons
		D)	genotypes


8	Which of the following terms describes the process whereby a piece of chromosome is broken and reinserted in the opposite orientation?
		A)	translocation
		B)	independent assortment
		C)	inversion
		D)	speciation


9	Plant breeders purposefully breed bananas to be triploid so that they are sterile and seedless.
		A)	True
		B)	False


10	Which of the following is true of the law of dominance?
		A)	Alleles control inheritance of various characteristics.
		B)	One pair of alleles may mask the expression of another pair.
		C)	First filial generations are always homozygous.
		D)	All of the above.


11	When Mendel crossed a homozygous recessive yellow-podded pea plant with a homozygous dominant green-podded plant the results were two green-podded plants and 2 yellow-podded plants.
		A)	True
		B)	False


12	The production of a pink-flowered offspring from crossing a red-flowered plant with a white-flowered plant is an example of ________.
		A)	incomplete dominance
		B)	backcross
		C)	independent assortment
		D)	maternal inheritance


13	In some plants, two separate genes may control a phenotypic characteristic by using a biochemical pathway.
		A)	True
		B)	False


14	The endosymbiont hypothesis explains why genetic characteristics, such as yield and days to flowering, are determined by both genotype and nature.
		A)	True
		B)	False


15	Which of the following explains the criteria needed for genetic equilibrium in large populations?
		A)	Law of Independent Assortment
		B)	Law of Artificial Selection
		C)	Hardy Weinberg Law
		D)	Law of Unit Characters

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