Transcript Meiosis and Genetics Test Review

Meiosis and Genetics Test
Review
Huntington's disease is caused by a dominant allele. If one of
your parents has the disease, what is the probability that you,
too, will have the disease?
A.
B.
C.
D.
100%
0%
50%
75%
[Default]
[MC Any]
[MC All]
Which of the following cells in humans
are haploid?
A.
B.
C.
D.
Gametes
Brain cells
Stomach cell
Nerve cells
[Default]
[MC Any]
[MC All]
In 1944 Charlie Chaplin was involved in a legal battle over the paternity of a child born to Joan
Berry, a young starlet. The baby was blood type B, the mother A, and Chaplin O. From what you
know about the inheritance of blood types, could Chaplin have been the father of the child? (At
the time of the trial, blood group evidence was not admissible in California courts. Charlie
Chaplin was declared responsible for the child's support.)
A. Perhaps, blood tests are inconclusive.
B. Yes, he could have fathered the child.
C. No, he could not possibly have fathered the
child.
D. In this case, more evidence must be given.
[Default]
[MC Any]
[MC All]
Black fur in mice (B) is dominant to brown fur (b) Short
tails (T) are dominant to long tails (t). What fraction of
the progeny of the cross BbTt x BBtt will have black fur
and long tails?
A.
B.
C.
D.
3/8
1/16
1/2
3/16
[Default]
[MC Any]
[MC All]
When crossing a homozygous recessive with a
heterozygote, what is the chance of getting an offspring
with the homozygous recessive phenotype?
A.
B.
C.
D.
0%
50%
75%
25%
[Default]
[MC Any]
[MC All]
Why are there so many phenotypes in
polygenic inheritance?
A. All of the alleles are dominant
B. Many genes for the same trait interact to
produce a continuous range of phenotypes
C. There are many alleles for each gene
D. All of the alleles are recessive
Which of the following correctly describes the
process being illustrated?
A. crossing-over in which alleles are exchanged
B. condensation and segregation of alleles
C. mutation in which the DNA content of the gene is
altered
D. segregation of sister chromatids
Mitosis and meiosis are processes involved in cellular
reproduction. Which of the following describes an
event that results from mitosis but NOT meiosis?
A. daughter cells that are identical to the
parent cell
B. four daughter cells that are produced from
each parent cell
C. two stages of cell division
D. replication of cellular genetic material
Brown eye color is dominant; blue is recessive. If a
brown-eyed man marries a blue-eyed woman and they
have a brown-eyed boy and a blue-eyed girl, we can
safely conclude that
A.
B.
C.
D.
the man is heterozygous.
both parents are homozygous.
the man is not the true father.
eye color is sex-linked.
In snapdragons, heterozygotes have pink flowers, whereas
homozygotes have red or white flowers. When plants with red
flowers are crossed with plants with white flowers, what
proportion of the offspring will have pink flowers?
A.
B.
C.
D.
0%
25%
50%
75%
[Default]
[MC Any]
[MC All]
Four different segments of a DNA molecule are
represented below. There is an error in the DNA in
which molecule?
A.
B.
C.
D.
segment 1 only
segment 3 only
segment 2 and 4
segment 2 and 3
[Default]
[MC Any]
[MC All]
If a woman who is red-green color-blind marries a man with
normal vision, what phenotypes would you expect their children
to have?
A. All their children will be color-blind.
B. All their daughters will have normal vision and will
not be carriers, but all their sons will be color blind.
C. All their daughters will be color-blind, but all their
sons will have normal vision.
D. All their daughters will be carriers and all their sons
will be color-blind.
[Default]
[MC Any]
[MC All]
What is inherited from a person’s
mother?
A.
B.
C.
D.
22 autosomes and a X or Y chromosome
22 autosomes and a X chromosome
44 autosomes and 2 sex chromosomes
22 sex chromosomes and 1 autosome
Which choice describes DNA after
replication has taken place?
A. two molecules, each with two old strands
B. two molecules, each with one original and one
new strand
C. two molecules, each with two new strands
D. one molecule with two original strands and
one molecule with two new strands
[Default]
[MC Any]
[MC All]
The most likely mode of inheritance is:
A.
B.
C.
D.
X-linked recessive
Autosomal dominant
X-linked dominant
Autosomal recessive
[Default]
[MC Any]
[MC All]
Widow’s peak is an autosomal dominant condition. The pedigree
given shows a family in which shaded individuals have the
condition. Which of the following must be true?
A.
B.
C.
D.
[Default]
[MC Any]
[MC All]
At least one parent of I2 has the trait
Individual I1 is heterozygous for the trait
II6 is a carrier
Any child of II1 and II2 has a one in two
chance of having the trait
Which of the following best describes how the process of
crossing over during meiosis leads to an increase in genetic
diversity?
A.
B.
C.
D.
During prophase II, fragments of DNA break off of chromosomes and
attach to the ends of other chromosomes, resulting in different gene
sequences.
During prophase II, sister chromatids separate from each other, and as
they travel to opposite ends of the cell, DNA segments of nearby
chromosomes are exchanged.
During prophase I, DNA segments are exchanged between homologous
chromosomes resulting in different combinations of alleles.
During prophase I, DNA replication takes place and homologous
chromosomes trade places with each other before lining up in
preparation for metaphase.
Which phrase best describes meiosis I?
A.
B.
C.
D.
Duplication of paired chromosomes
Fusion of sister chromatids
Division of homologous chromosomes
Creation of two diploid cells
Which of the following carries amino
acids to the site of protein synthesis?
A.
B.
C.
D.
nRNA
mRNA
rRNA
tRNA
The process of synthesizing mRNA
along a DNA template is called
A.
B.
C.
D.
Transcription
replication
translation
transformation