BIO 148 EXAM 3 QUESTIONS WITH
CORRECT ANSWERS
Ploidy after DNA replication before meiosis begins - Correct Answers -2n
Ploidy after Meiosis 1 and cytokinesis - Correct Answers -n
Ploidy after meiosis 2 and cytokinesis - Correct Answers -n
Ploidy after fertilization - Correct Answers -2n
nonsister chromatids - Correct Answers -DNA molecules that can exchange small
stretched of genetic material during prophase 1 of meiosis
(T/F) nonsister chromatids have the same genes but may have different alleles of those
genes - Correct Answers -T
(T/F) nonhomologous chromosomes have the same genes but may have different
alleles of those genes - Correct Answers -F
in sexually reproducing species how does the number of chromosomes in offspring
compare to the number of chromosomes in their parent - Correct Answers -they have
the same chromosome number
Chimpanzees are diploid organism with 48 chromosomes, a chimpanzee cell at
metaphase of meiosis 1 has which of the following - Correct Answers -non homologous
chromosomes, homologous chromosomes, sister chromosomes
, which of the following always have identical alleles in diploid cells directly after DNA
replication but before they enter meiosis - Correct Answers -sister chromatids
for an organism with 2n=8 which of the following is true - Correct Answers -there will be
8 chromosomes in cells that are just beginning meiosis, there will be 4 chromosomes in
cells after meiosis 1 and cytokinesis
a cell from an organism with 2n=4 has 2 chromosomes and 4 dna molecules what stage
of meiosis is it in - Correct Answers -metaphase 2
in cats, 2n=38 how many chromosomes are in a somatic cell in a cat - Correct Answers
-38
a diploid organism has 18 chromosomes. a cell from this organism has 9 chromosomes
and 9 dna molecules this cell is at what stage of meiosis - Correct Answers -end of
meiosis 2
AA and Aa determine black fur: aa determines white. BB and Bb determine brown eyes:
bb determine blue.If a female dog with the genotype AaBb mates with a white-furred,
blue eyed male dog, what is the predicted types and proportion of their puppies?A.All
black fur with brown eyes. - Correct Answers -1/4 black fur with brown eyes, 1/4 black
fur with blue eyes, 1/4 white fur with brown eyes, 1/4 white fur with blue eyes.The cross
is AaBb x aabb. ¼ of the offspring are AaBb; ¼ are aaBb; ¼ are Aabb; ¼ are aabb
humans are diploid with 2n=46. a human germline call at metaphase of meiosis 2
contains ____ chromosomes ____ homologous pairs and ____ dna molecules - Correct
Answers -23, 0, 46 (in meiosis II, cells are haploid and since homologs separated in
meiosis I, they are no longer in the same cell in meiosis II. In metaphase II, each
chromosome still consist of 2 DNA molecules)
in a dihybrid cross between two individuals with the genotype AaBb x AaBb what
proportion of the offspring will have the genotype AABB - Correct Answers -1/16
a new mutation occurs in a germline cell and is passed on to offspring. The mutation
creates a new phenotype not previously present in the population. which of the following
has/have occured - Correct Answers -evolution and an increase in genetic variation in
the population
In the graph, Why did average fitness stay the same from generations 1500 -2000? -
Correct Answers -beneficial mutation did not occur
which of the following evolutionary forces can decrease the average relative fitness of a
population over time - Correct Answers -mutation, gene flow, genetic drift
Which of the following statements is FALSE?
a.Genetic drift can cause a population to evolve
CORRECT ANSWERS
Ploidy after DNA replication before meiosis begins - Correct Answers -2n
Ploidy after Meiosis 1 and cytokinesis - Correct Answers -n
Ploidy after meiosis 2 and cytokinesis - Correct Answers -n
Ploidy after fertilization - Correct Answers -2n
nonsister chromatids - Correct Answers -DNA molecules that can exchange small
stretched of genetic material during prophase 1 of meiosis
(T/F) nonsister chromatids have the same genes but may have different alleles of those
genes - Correct Answers -T
(T/F) nonhomologous chromosomes have the same genes but may have different
alleles of those genes - Correct Answers -F
in sexually reproducing species how does the number of chromosomes in offspring
compare to the number of chromosomes in their parent - Correct Answers -they have
the same chromosome number
Chimpanzees are diploid organism with 48 chromosomes, a chimpanzee cell at
metaphase of meiosis 1 has which of the following - Correct Answers -non homologous
chromosomes, homologous chromosomes, sister chromosomes
, which of the following always have identical alleles in diploid cells directly after DNA
replication but before they enter meiosis - Correct Answers -sister chromatids
for an organism with 2n=8 which of the following is true - Correct Answers -there will be
8 chromosomes in cells that are just beginning meiosis, there will be 4 chromosomes in
cells after meiosis 1 and cytokinesis
a cell from an organism with 2n=4 has 2 chromosomes and 4 dna molecules what stage
of meiosis is it in - Correct Answers -metaphase 2
in cats, 2n=38 how many chromosomes are in a somatic cell in a cat - Correct Answers
-38
a diploid organism has 18 chromosomes. a cell from this organism has 9 chromosomes
and 9 dna molecules this cell is at what stage of meiosis - Correct Answers -end of
meiosis 2
AA and Aa determine black fur: aa determines white. BB and Bb determine brown eyes:
bb determine blue.If a female dog with the genotype AaBb mates with a white-furred,
blue eyed male dog, what is the predicted types and proportion of their puppies?A.All
black fur with brown eyes. - Correct Answers -1/4 black fur with brown eyes, 1/4 black
fur with blue eyes, 1/4 white fur with brown eyes, 1/4 white fur with blue eyes.The cross
is AaBb x aabb. ¼ of the offspring are AaBb; ¼ are aaBb; ¼ are Aabb; ¼ are aabb
humans are diploid with 2n=46. a human germline call at metaphase of meiosis 2
contains ____ chromosomes ____ homologous pairs and ____ dna molecules - Correct
Answers -23, 0, 46 (in meiosis II, cells are haploid and since homologs separated in
meiosis I, they are no longer in the same cell in meiosis II. In metaphase II, each
chromosome still consist of 2 DNA molecules)
in a dihybrid cross between two individuals with the genotype AaBb x AaBb what
proportion of the offspring will have the genotype AABB - Correct Answers -1/16
a new mutation occurs in a germline cell and is passed on to offspring. The mutation
creates a new phenotype not previously present in the population. which of the following
has/have occured - Correct Answers -evolution and an increase in genetic variation in
the population
In the graph, Why did average fitness stay the same from generations 1500 -2000? -
Correct Answers -beneficial mutation did not occur
which of the following evolutionary forces can decrease the average relative fitness of a
population over time - Correct Answers -mutation, gene flow, genetic drift
Which of the following statements is FALSE?
a.Genetic drift can cause a population to evolve
