Multiple Choice

Please answer all questions


1	In his experiments on pea plants, Gregor Mendel concluded that:
		A)	inheritance involves a blending of substances
		B)	individual particles control biological traits
		C)	biological variations are determined by environment
		D)	amino acids are the chief components of proteins


2	Which of the following code for combinations of amino acids make a protein?
		A)	chromosomes
		B)	enzymes
		C)	particles
		D)	genes


3	Chromosomes are:
		A)	long strands of genetic material found in the nucleus of the cell
		B)	long strands of genetic material found in the cell membrane
		C)	the chief component of proteins
		D)	the chief component of cells


4	The material that carries genetic information is called:
		A)	DNA
		B)	tRNA
		C)	a gene
		D)	a particulate


5	A codon is:
		A)	a chain of amino acids
		B)	a genetic "word" made up of three bases
		C)	also known as a double helix
		D)	made of proteins and nucleic acid


6	A polygenic trait is:
		A)	coded for by a single gene
		B)	located in the cytoplasm
		C)	coded for by more than one gene
		D)	expressed when mRNA attaches to DNA


7	A genotype is:
		A)	inherited from the mother
		B)	dominant to the recessive phenotype
		C)	an organism's combination of alleles for a particular trait
		D)	a chemical or physical result of the genetic code


8	Having two different alleles in a pair is referred to as:
		A)	dominant
		B)	homozygous
		C)	recessive
		D)	heterozygous


9	A phenotype is:
		A)	the physical expression of the genotype
		B)	the chemical result of the genetic code
		C)	an observable trait
		D)	all the above


10	The alleles that are always expressed in the phenotype are:
		A)	dominant
		B)	recessive
		C)	taster
		D)	nontaster


11	Gametes are:
		A)	produced during mitosis
		B)	specialized sex cells
		C)	fertilized eggs
		D)	all the above


12	Which of the following have one-half the normal number of chromosomes and genes?
		A)	loci
		B)	mutations
		C)	zygotes
		D)	gametes


13	If a person homozygous dominant for tongue rolling (RR) produces children with a heterzygote, what is the probability that they will produce a child who is phenotypically a tongue roller?
		A)	100%
		B)	75%
		C)	50%
		D)	25%


14	About 99% of the human genome is thought to be:
		A)	harmless
		B)	mutated
		C)	noncoding
		D)	useless


15	Approximately how many genes are now thought to make up the human genome?
		A)	3,000
		B)	30,000
		C)	30 million
		D)	3 billion

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