Exam 3 Christopher Gregg LSU
(Chapters 13,14,15,16 & 17) Test
Questions with Complete Solutions.
Genetic diversity requires __________. - Answer sexual reproduction, independent
assortment, crossing over between nonsystem chromatids of homologous chromosomes, and
random fertilization
Which of the following occurs in meiosis, but not mitosis? - Answer Homologous
chromosomes separate.
Sister chromatids differ from nonsister chromatids in that sister chromatids __________. -
Answer are products of the S phase of the cell cycle and are two copies of one chromosome
The major contribution of sex to evolution is that __________. - Answer it provides a
method to increase genetic variation
__________ are a group of genetically identical individuals produced by a process called
__________. - Answer Clones; asexual reproduction
In meiosis, __________ of __________ cross over and form __________. - Answer nonsister
chromatids; homologous pairs; chiasmata
Unless the chromosomes were stained to show band patterns, a karyotype would be least likely
to show which of the following? - Answer Part of a chromosome turned around.
Regardless of whether an organism is an animal, a plant, a fungus, or an algal cell, all zygotes are
__________ and are formed during the __________ of two __________ gametes. - Answer
diploid; fertilization; haploid
Allelic variation is an important source of __________ in a population. - Answer genetic
diversity
Which of the following statements about homologous chromosomes is correct? - Answer
They have genes for the same traits at the same loci.
How many genes are present in the human genome? - Answer Tens of thousands
, Characteristic of the bdelloid rotifer is that it __________. - Answer is an example of an
animal that has not reproduced sexually in 40 million years
A clone is the product of __________. - Answer asexual reproduction and mitosis
A pair of genetic structures carrying genes that control the same inherited characters are called
__________. - Answer homologous chromosomes
The process called __________ reduces the chromosome number by __________. - Answer
meiosis; two consecutive cell divisions
Somatic cells in humans differs from gametes in that human somatic cells __________. - Answer
contain two sets of each of the 23 chromosome types
The zipper-like complex that forms in meiosis occurs during __________ and is called the
__________. - Answer prophase I; synaptonemal complex
Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid
number of 8? - Answer 16
What is the result when a diploid cell undergoes meiosis? - Answer Four haploid cells
Somatic cells in animals differ from gametes in that somatic cells __________. - Answer are
all of the cells of the body except for the gametes and their precursors
A life cycle in which the only multicellular form is haploid is most typical of __________. -
Answer fungi
What is a locus? - Answer The precise location of a gene on a chromosome.
Which life cycle stage is found in plants but not animals? - Answer Multicellular haploid
Regarding the role of cohesin protein in maintaining cohesion between sister chromatids, which
of the following statements is false? - Answer During meiosis II, cohesion holds sister
chromatids together along their lengths as the second meiotic spindle forms.
At the end of mitosis, __________ daughter cells that are genetically __________ are formed,
while at the end of meiosis, __________ daughter cells that are genetically __________ are
formed. - Answer two; identical; four; distinct
(Chapters 13,14,15,16 & 17) Test
Questions with Complete Solutions.
Genetic diversity requires __________. - Answer sexual reproduction, independent
assortment, crossing over between nonsystem chromatids of homologous chromosomes, and
random fertilization
Which of the following occurs in meiosis, but not mitosis? - Answer Homologous
chromosomes separate.
Sister chromatids differ from nonsister chromatids in that sister chromatids __________. -
Answer are products of the S phase of the cell cycle and are two copies of one chromosome
The major contribution of sex to evolution is that __________. - Answer it provides a
method to increase genetic variation
__________ are a group of genetically identical individuals produced by a process called
__________. - Answer Clones; asexual reproduction
In meiosis, __________ of __________ cross over and form __________. - Answer nonsister
chromatids; homologous pairs; chiasmata
Unless the chromosomes were stained to show band patterns, a karyotype would be least likely
to show which of the following? - Answer Part of a chromosome turned around.
Regardless of whether an organism is an animal, a plant, a fungus, or an algal cell, all zygotes are
__________ and are formed during the __________ of two __________ gametes. - Answer
diploid; fertilization; haploid
Allelic variation is an important source of __________ in a population. - Answer genetic
diversity
Which of the following statements about homologous chromosomes is correct? - Answer
They have genes for the same traits at the same loci.
How many genes are present in the human genome? - Answer Tens of thousands
, Characteristic of the bdelloid rotifer is that it __________. - Answer is an example of an
animal that has not reproduced sexually in 40 million years
A clone is the product of __________. - Answer asexual reproduction and mitosis
A pair of genetic structures carrying genes that control the same inherited characters are called
__________. - Answer homologous chromosomes
The process called __________ reduces the chromosome number by __________. - Answer
meiosis; two consecutive cell divisions
Somatic cells in humans differs from gametes in that human somatic cells __________. - Answer
contain two sets of each of the 23 chromosome types
The zipper-like complex that forms in meiosis occurs during __________ and is called the
__________. - Answer prophase I; synaptonemal complex
Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid
number of 8? - Answer 16
What is the result when a diploid cell undergoes meiosis? - Answer Four haploid cells
Somatic cells in animals differ from gametes in that somatic cells __________. - Answer are
all of the cells of the body except for the gametes and their precursors
A life cycle in which the only multicellular form is haploid is most typical of __________. -
Answer fungi
What is a locus? - Answer The precise location of a gene on a chromosome.
Which life cycle stage is found in plants but not animals? - Answer Multicellular haploid
Regarding the role of cohesin protein in maintaining cohesion between sister chromatids, which
of the following statements is false? - Answer During meiosis II, cohesion holds sister
chromatids together along their lengths as the second meiotic spindle forms.
At the end of mitosis, __________ daughter cells that are genetically __________ are formed,
while at the end of meiosis, __________ daughter cells that are genetically __________ are
formed. - Answer two; identical; four; distinct
