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Which trait is controlled by
a gene with multiple alleles?
a. Blood type
b. Straight hairline
c. Smile dimples
d. widow’s peak
A. Blood type
What are multiple alleles?
a. More than 2 genes for a trait
b. Three or more chromosomes
that determine a trait
c. 2 codominant genes
d. 3 or more forms of a gene
that code for a single trait
D. 3 or more forms
of a gene that code
for a single trait
Why does height in humans have
such a wide variety of
phenotypes?
A. Controlled by a recessive allele
b. Has only 2 alleles
c. Controlled by sex-linked genes
d. Controlled by at least 4 genes
D. Controlled by at
least 4 genes
What controls variations in skin
color among humans?
a. Multiple alleles
b. A person’s diet
c. Two alleles of a single gene
d. At least 3 genes
D. At least 3 genes
What human trait is altered by
variations in the
environment?
a.Smile dimples
b.Blood type
c. Height
d. Skin color
c. Height
What is a pedigree?
A. Chart tracking family members
that have a certain trait
b. Picture of chromosomes
c. Geneticist studying traits
d. Allele passed from parent to
offspring
A. Chart tracking family
members that have a certain
trait
Genetic disorders are caused
by
a. Dominant alleles
b. Pedigrees
c. sickle-shaped cells
d. mutations
d. mutations
Down Syndrome occurs when
A. A person inherits a recessive
allele
b. Sickle-shaped cells get stuck
in blood vessels
c.chromosomes fail to separate
properly
d. blood does not clot properly
c.chromosomes fail to
separate properly
Why are sex-linked traits more
common in males than females?
a.All alleles on the X are dominant
b. All alleles on the Y are
recessive
c. A recessive on the X produces
the trait in a male
d. The X and Y are codominant
c. A recessive on the X
produces the trait in a male
What is a karyotype?
A.blood from a new born baby
b. Fluid surrounding an unborn
baby
c. Picture of chromosomes in a
cell
d. Picture of a baby before it is
born
c. Picture of chromosomes in a
cell
Cloning results in organisms
that are
a. Genetically similar
b. Produced from cuttings
c. Both adult mammals
d. Genetically identical
d. Genetically identical
No two people have the same
DNA except for
a.Brothers
b.Sisters
c.Identical twins
d. Crime suspects
c. Identical twins
Which form of selective breeding
crosses genetically different
individuals in an attempt to keep
the best traits of both parents?
a.Hybridization
b. inbreeding
c.Cloning
d.Genetic engineering
a.Hybridization
What is a genome?
A.All the plasmids from splicing
DNA in a cell
B.All the DNA in one cell of an
organism
C.All the karyotypes in a cell
D.All the cells produced during
meiosis
b.All the DNA in one cell of
an organism