For each of the following questions, choose the letter that corresponds to the best answer.

1		When Mendel crossed a true-breeding violet with a true-breeding white plant, all of the F1 generation were violet. Therefore we may conclude that the allele for violet in the pea plant is:
			A)	recessive
			B)	dominant
			C)	codominant
			D)	intermediate in expression
2		The term phenotype refers to:
			A)	a trait which is dominant
			B)	a trait which is recessive
			C)	an individual’s genetic make-up
			D)	an individual’s appearance
3		Heterozygous means that an individual has:
			A)	two different alleles for the same gene
			B)	the same alleles for the same gene
			C)	the same alleles for differing genes
			D)	two different alleles for differing genes
4		A method for estimating environmental influence on a particular trait is through the study of:
			A)	dominant alleles
			B)	recessive alleles
			C)	humans compared with other organisms
			D)	twins
5		The principle of independent assortment:
			A)	states that inheritance patterns of differing traits are independent of one another
			B)	states that paired hereditary factors separate and form sex cells containing either one or the other factor
			C)	applies only to humans
			D)	B and C only
6		An allele is:
			A)	the complementary base to thymine
			B)	the dominant form of a gene
			C)	an alternate form of a gene
			D)	an X-linked gene
7		The chromosomes are located within the cell's:
			A)	nucleus
			B)	chromatids
			C)	DNA
			D)	cytoplasm
8		Meiosis is the process by which:
			A)	single cell organisms reproduce
			B)	growth and replacement of cells occur in multicellular animals
			C)	gametes are produced
			D)	all of the above
9		In the DNA molecule the base cytosine always forms a complementary pair with:
			A)	another cytosine
			B)	guanine
			C)	thymine
			D)	adenine
10		Physically, the nuclear DNA molecule can be described as a:
			A)	circular; like a snake eating its own tail
			B)	many spheres, linked end to end
			C)	two-dimensional ladder
			D)	double helix