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