Unit 7 Progress Check: MCQ Part B Questions & Answers 2024 ( A+ GRADED 100% VERIFIED)

Unit
7
Progress
Check:
MCQ
Part
B
Which
of
the
following
sets
of
data
provides
evidence
that
best
supports
common
ancestry
for
organisms
in
all
three
domains?
-
ANS
Organisms
in
Bacteria,
Archaea,
and
Eukarya
each
have
adenine,
thymine,
guanine,
and
cytosine
bases
forming
their
DNA.
Which
statement
below
best
states
an
alternative
hypothesis
Fox
could
have
used
to
frame
his
research?
-
ANS
In
the
presence
of
available
energy
and
the
absence
of
a
significant
quantity
of
atmospheric
O2
simple
proteins
will
form
spontaneously
from
a
mixture
of
amino
acids.
Iridium
is
an
element
that
is
rare
on
Earth
but
commonly
found
in
meteorites.
A
scientist
believes
that
the
first
organic
molecules
may
have
come
to
Earth
on
meteorites
3.6
billion
years
ago.
Which
of
these
would
be
an
appropriate
null
hypothesis
to
test
related
to
whether
meteorites
hit
the
Earth
3.6
billion
years
ago?
-
ANS
There
is
no
difference
in
iridium
levels
in
sediments
that
were
deposited
on
Earth
3.6
billion
years
old,
compared
to
recent
sediments.
Based
on
the
data
in
Figure
1,
which
of
the
following
would
most
affect
the
allelic
frequencies
of
the
populations
on
Isabela
and
Butuan?
-
ANS
Immigration
of
individuals
from
Metro
Manila
into
the
two
populations
Which
of
the
following
best
explains
the
trend
shown
in
Figure
1?
(Kentucky
Derby)
-
ANS
By
1940,
most
genetic
variation
for
speed
had
been
lost
from
the
gene
pool.
There
are
two
species
of
elephant
seals:
northern
elephant
seals,
Mirounga
angustirostris,
found
off
the
western
coast
of
North
America
from
Baja
California
to
the
Gulf
of
Alaska,
and
southern
elephant
seals,
M.
leonina,
found
in
the
southern
oceans.
Hunting
in
the
nineteenth
century
has
been
blamed
for
a
drastic
reduction
in
the
northern
elephant
seal
population.
Even
though
the population
has
rebounded
following
restrictions
on
seal
hunting,
genetic
variation
is
greatly
reduced
in
the
northern
species
compared
to
that
in
the
southern
species.
Which
of
the
following
conditions
of
Hardy-Weinberg
equilibrium
was
most
likely
not
met
in
the
northern
elephant
seal
population
following
overhunting?
-
ANS
Large
population
size
In
a
certain
small
mammal,
fur
color
is
controlled
by
a
pair
of
alleles,
with
B
being
dominant
over
b.
The
genotypes
BB
and
Bb
result
in
dark-colored
fur,
the
genotype
bb
results
in
light-colored
fur.
A
population
of
the
species
has
the
following
allele
frequencies:
B=0.85
and
b=0.15.
If
a
fire
caused
the
surface
of
the
ground
in
the
habitat
of
the
species
to
become
darker
in
color,
which
of
the
following
claims
about
the
impact
on
the
allele
frequencies
in
this
population
is
most
reasonable?
-
ANS
The
frequency
of
the
B
allele
will
increase
because
light-colored
individuals
will
be
more
visible
to
predators.
A
group
of
researchers
noticed
that
using
a
particular
drug
to
treat
cancer
in
mice
would
reduce
the
size
of
the
tumor,
but
some
of
the
tumor
cells
appeared
to
be
resistant
to
the
drug
since
some
of
these
cells
would
increase
in
number
over
time.
The
researchers
wish
to
increase
the
reliability
of
their
experimental
observations
before
investigating
new
claims
that
chemotherapy-resistant
tumors
are
an
example
of
continuing
evolution.
Of
the
following,
which
is
the
best
next
step
the
researchers
might
take
to
increase
the
reliability
of
their
evidence?
-
ANS
Increasing
the
number
of
trials
and
the
number
of
mice
in
each
treatment
group
A
population
geneticist
is
conducting
an
investigation
on
a
population
of
mice.
The
geneticist
determines
the
genotypes
for
a
particular
trait
of
all
of
the
mice
in
the
population
during
generation
1
and
then
removes
all
of
the
mice
with
the
genotype
aa.
The
remaining
members
of
the
population
are
allowed
to
randomly
mate
with
one
another
to
produce
generation
2
and
future
generations.
A
model
of
the
investigation
is
shown
in
Figure
1.
Each
of
the
fifteen
genotypes
shown
in
generation
1
and
generation
2
represents
100
mice.