Download What creates variation in the offspring of sexually reproducing

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1.
2.
3.
4.
Which process allows sexually reproducing
organisms to create gametes with half the
number of chromosomes of the body cells?
Mitosis
25% 25% 25% 25%
Meiosis
Fertilization
Reproduction
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A branch cut off of a geranium plant grows into
a new plant. Will the new plant be different
from its parent plant?
1. yes, because mitosis will
25% 25% 25% 25%
take place in the new plant
2. yes, because meiosis will
take place in the old plant.
3. no, because meiosis and
fertilization did not take
place.
4. no, because the new plant
was formed from gametes.
Cats have many different possible coat
colors. What does this show?
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25% 25% 25% 25%
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1. mutations occurring in
sexually reproducing
organisms
2. reproduction in asexually
reproducing organisms
3. division of body cells in
adult organisms
4. variation in sexually
reproducing organisms
What is true of asexual reproduction?
Offspring that
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25% 25% 25% 25%
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1. are identical to their
parents.
2. resemble their
parents.
3. are quite different
that their parents.
4. are random and can
have different
results each time.
What is the result of a single cell going
through the process of meiosis?
1. one identical new
cell
2. two identical new
cells
3. three identical
haploid bodies
4. four gamete cells
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25% 25% 25% 25%
What is an advantage of asexual
reproduction?
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25% 25% 25% 25%
th
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1. the offspring are not
identical to their
parents
2. the offspring are
identical to their
parents
3. there are more
offspring produced
4. there are fewer
offspring produced
Where are genes for sex-linked traits
located?
1. They can be on any
chromosome
2. On the “Y”
chromosome
3. On the “X”
chromosome
4. On chromosome
pair # 21
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“Y
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...
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.. .
25% 25% 25% 25%
A white flower crossed with a red flower produces pink
offspring. This is an example of incomplete dominance.
If two of the pink-flowered plants are crossed, what
ratio will the genotypes of the offspring have?
25%
25%
25%
rr
w
3R
r:
1
W
:2
w
2R
1R
R:
2
Rr
R:
3
:1
Rr
...
1 RR: 3 Rr
1 RR: 2 Rr: 1 rr
2 Rw: 2 Ww
3 Rr: 1 rr
1R
1.
2.
3.
4.
25%
Why are blood types considered an
example of codominance?
1. there are four types of blood,
not two
2. blood type O can be donated
to anyone, AB cannot
3. blood types A and B will both
be expressed when present
4. there are three alleles for
blood type and four types of
blood
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25% 25% 25% 25%
How many pairs of homologous
chromosomes do humans have?
25%
25%
52
25%
46
25%
22
4
22
46
52
4
1.
2.
3.
4.
If two different alleles are present,
which allele is expressed?
yp
e
25%
Ge
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an
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in
Do
m
25%
yp
e
25%
Ph
en
ot
25%
e
Recessive
Dominant
Phenotype
Genotype
Re
ce
ss
iv
1.
2.
3.
4.
A tall pea plant (DD) and a tall pea
plant (Dd) have what in common?
or
25%
co
l
25%
Se
ed
yp
e
25%
Ge
no
t
yp
e
25%
Al
le
le
s
Phenotype
Genotype
Alleles
Seed color
Ph
en
ot
1.
2.
3.
4.
In crossing homozygous dominant and homozygous
recessive pea plants, Mendel noted that some genes
were not seen in the F1 generation and were seen in
only 25% of the F2 generation. What did he call these
25% 25% 25% 25%
genes?
m
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d.
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In
co
Le
th
e
Re
ce
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iv
an
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Dominant
Recessive
Lethal
Incompletely
dominant
Do
m
in
1.
2.
3.
4.
One cat carries heterozygous, long-haired traits (Ss),
and its mate carries homozygous short-haired traits
(ss). What is the probability of one of their offspring
having long hair?
1.
2.
3.
4.
100%
75%
50%
25%
25%
0%
10
25%
%
75
25%
%
50
25%
%
25
A person with phenotype O blood has
how many possible genotypes?
25%
25%
2
25%
3
25%
1
6
1
3
2
6
1.
2.
3.
4.
Which pair of chromosomes produces
a female offspring?
.
ch
r..
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af
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al
X
ch
r..
.
25%
e
X
ch
r
Y
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al
af
em
af
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Y
ch
r
...
25% 25%
...
25%
af
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1. a female Y chromosome
and a male Y chromosome.
2. a female Y chromosome
and a male X chromosome.
3. a female X chromosome
and a male X chromosome.
4. a female X chromosome
and a male Y chromosome.
Crossing a snap dragon that has red flowers with one
that has white flowers produces a snap dragon with
pink flowers. The trait for flower color exhibits
1. Codominance
2. Incomplete
dominance
3. Multiple alleles
4. Complete
dominance
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co
Co
do
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25% 25% 25% 25%
On which of the following chromosomes
would a sex-linked trait most likely be
found?
25%
25%
YO
25%
O
25%
Y
X
Y
O
YO
X
1.
2.
3.
4.
An organism that has two identical
alleles for the same trait is called
_______ for that particular trait.
20%
an
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Re
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Do
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20%
e
20%
an
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20%
zy
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ou
s
Homozygous
Heterozygous
Dominant
Recessive
codominant
Ho
m
1.
2.
3.
4.
5.
20%
In a heterozygous individual the allele
being expressed is
nd
a
t.
25%
do
m
in
an
25%
nt
.
25%
re
du
25%
m
as
ke
d.
recessive.
masked.
redundant.
dominant.
re
ce
ss
ive
.
1.
2.
3.
4.
Let P = purple flowers and p = white, and T = tall
plants and t = dwarf. What would be the
appearance of a plant with the genotype PpTt?
pl
e
pu
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e
pa
l
flo
hi
te
w
fl.
..
er
s,.
..
20% 20%
w
er
s,.
..
w
flo
hi
te
w
e
pu
rp
l
flo
w
e
pu
rp
l
flo
w
er
s. .
.
1. purple flowers, tall
2. purple flowers,
dwarf
3. white flowers, tall
4. white flowers, dwarf
5. pale purple flowers,
intermediate height
20% 20%
er
s. .
.
20%
One of the main reasons genes sort
independent of one another is that
1. they produce unrelated
traits.
2. they produce related
traits.
3. they are on the same
chromosome.
4. they are different alleles.
5. they are on different
chromosomes.
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its
.
20% 20% 20% 20% 20%
A single gene has 3 or more alternative
forms. These are called
25% 25%
25%
m
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25%
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heterozygotes.
multiple alleles.
homozygotes.
multiple zygotes.
he
te
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zy
go
te
s.
m
ul
t ip
le
al
le
l..
.
1.
2.
3.
4.
When Mendel crossed two purple-flowered pea
plants with each other, he obtained a
phenotypic ratio of 3:1 (purple pea plants to
white pea plants). What are the parents?
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p.
..
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us
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ho
m
oz
yg
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1. homozygous dominant purple pea
plant and homozygous recessive
white pea plant
2. homozygous dominant purple pea
plant and heterozygous white pea
plant
3. heterozygous purple pea plant and
homozygous dominant purple pea
plant
4. heterozygous purple pea plant and
heterozygous purple pea plant
25% 25% 25% 25%
.
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in
an
ca
n
no
t
do
m
re
ce
ss
ive
.
sex-linked.
recessive.
dominant.
cannot determine
from the
information
provided.
se
xli
1.
2.
3.
4.
nk
ed
.
As a genetic counselor, you are constructing a
human pedigree for a particular disease. You
note that every generation shows the trait,
suggesting that it 25%
is 25% 25% 25%
Gregor Mendel worked with what kind
or plant?
25%
an
s
25%
Be
25%
W
he
at
25%
Co
rn
Peas
Corn
Wheat
Beans
Pe
as
1.
2.
3.
4.
Each alternative form of a gene for a
certain trait is called a(n)?
25%
i. .
.
25%
Re
ce
ss
iv
et
ra
yp
e
25%
Ph
en
ot
yp
e
25%
Al
le
le
Genotype
Allele
Phenotype
Recessive trait
Ge
no
t
1.
2.
3.
4.
m
ot
he
rI
Bi
,f
a.
..
f..
.
ot
he
rI
BI
B,
M
,f
. ..
m
ot
he
rI
Bi
m
ot
he
rI
BI
B,
f..
.
A woman who has type B blood marries a man
who has type A blood. They have five children,
all of which have type AB blood. What are the
most probable parental genotypes?
25% 25% 25% 25%
1. mother IBIB, father
IAIA
2. mother IBi , father IAi
3. Mother IBIB, father
IAi
4. mother IBi, father
IAIA