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1) Genetic disorders are caused by
A
mutations
B
dominate alleles
C
pedigrees
D
sickle-shaped calls
2) What is the genetic code?
A
the number of nitrogen bases in a DNA molecule
B
the order of amino acids in a protein
C
the number of guanine and cytosine bases in a chromosome
D
the order of nitrogen bases along a gene
3) If a homozygous black guinea pig (BB) crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
A
50 percent
B
100 percent
C
25 percent
D
75 percent
4) How do most fossils form?
A
An insect becomes trapped in amber
B
an entire organism becomes buried in sediment
C
a dead organism becomes buried in tar
D
an entire organism becomes frozen in ice
5) What genetic disorder results in abnormally shaped blood cells?
A
cystic fibrosis
B
sickle-cell disease
C
Hemophillia
D
Down syndrome
6) What does the notation tt mean to geneticists
A
one dominate and one recessive allele
B
two dominate alleles
C
at least one dominate allele
D
two recessive allels
7) Hemophilia is caused by a(n)
A
dominate allele
B
extra chromosome
C
codominate allele
D
recessive allele on the X chromosome
8) Factors that control traits are called
A
parents
B
genes
C
recessives
D
purebreads
9) An organisms physical apearance is its
A
genotype
B
phenotype
C
heterozygous
D
codominance
10) Sex-linked genes are genes on
A
the Y chromosome only
B
the X chromosome only
C
all 23 pairs of chromosomes
D
the X and Y chromosomes
*select an answer for all questions
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