BIO 226N Exam 4 Questions With Complete Solutions
asexual reproduction Correct Answers Asexual reproduction is
a genetic copy of the parent traits/cells to the daughter cells with
no genetic variation.
autosome and sex chromosome Correct Answers Autosomes
are involved in determining the somatic characters of an
individual and sex chromosomes are involved in determining the
sex and the sex-related hormonal traits
Be able to define a gene mutation. Correct Answers A mutation
is a change in a DNA sequence. Mutations can result from DNA
copying mistakes made during cell division, exposure to
ionizing radiation, exposure to chemicals called mutagens, or
infection by viruses
Be able to explain codominance and give an example Correct
Answers Codominance means that neither allele can mask the
expression of the other allele. An example in humans would be
the ABO blood group, where alleles A and alleles B are both
expressed.
Compare cytokinesis in animals and plants Correct Answers
the formation of new cell wall surrounding the daughter cells.
Plant cells form a cell plate between the two daughter cells. In
animal cells, a cleavage furrow is formed between the two
daughter cells.
Describe the events characteristics of Anaphase Correct
Answers The chromosomal centromere breaks down and the
, two chromatids are now chromosomes. The spindle
microtubules attached to the chromosome kinetochores shorten
and pull the chromosomes toward the spindle poles.
Describe the events characteristics of Metaphase Correct
Answers The chromosomes are completely condensed and the
tension from the spindle microtubules results in the
chromosomes lining up on the equator of the cell, equidistant
from the spindle poles.
Describe the events characteristics of Prophase Correct
Answers
Describe the events characteristics of Telophase Correct
Answers As soon as they reach the spindle poles, They detach
from the spindle microtubules and chromosomes return to their
thread-like form. The nuclear membrane vesicles fuse to reform
the nuclear membrane around the chromosomes.
Describe the function of telomeres. Correct Answers These are
little protective caps at the ends of the DNA molecules that
make up our chromosomes. Their job is to stop the ends of
chromosomes from fraying or sticking to each other, much like
the plastic tips on the ends of shoelaces
Describe the process of binary fission in bacteria Correct
Answers 1) DNA replication begins at the ori site
2) Replicated DNA segregates to either end of the cell
3) Cytokinesis produces two cells
asexual reproduction Correct Answers Asexual reproduction is
a genetic copy of the parent traits/cells to the daughter cells with
no genetic variation.
autosome and sex chromosome Correct Answers Autosomes
are involved in determining the somatic characters of an
individual and sex chromosomes are involved in determining the
sex and the sex-related hormonal traits
Be able to define a gene mutation. Correct Answers A mutation
is a change in a DNA sequence. Mutations can result from DNA
copying mistakes made during cell division, exposure to
ionizing radiation, exposure to chemicals called mutagens, or
infection by viruses
Be able to explain codominance and give an example Correct
Answers Codominance means that neither allele can mask the
expression of the other allele. An example in humans would be
the ABO blood group, where alleles A and alleles B are both
expressed.
Compare cytokinesis in animals and plants Correct Answers
the formation of new cell wall surrounding the daughter cells.
Plant cells form a cell plate between the two daughter cells. In
animal cells, a cleavage furrow is formed between the two
daughter cells.
Describe the events characteristics of Anaphase Correct
Answers The chromosomal centromere breaks down and the
, two chromatids are now chromosomes. The spindle
microtubules attached to the chromosome kinetochores shorten
and pull the chromosomes toward the spindle poles.
Describe the events characteristics of Metaphase Correct
Answers The chromosomes are completely condensed and the
tension from the spindle microtubules results in the
chromosomes lining up on the equator of the cell, equidistant
from the spindle poles.
Describe the events characteristics of Prophase Correct
Answers
Describe the events characteristics of Telophase Correct
Answers As soon as they reach the spindle poles, They detach
from the spindle microtubules and chromosomes return to their
thread-like form. The nuclear membrane vesicles fuse to reform
the nuclear membrane around the chromosomes.
Describe the function of telomeres. Correct Answers These are
little protective caps at the ends of the DNA molecules that
make up our chromosomes. Their job is to stop the ends of
chromosomes from fraying or sticking to each other, much like
the plastic tips on the ends of shoelaces
Describe the process of binary fission in bacteria Correct
Answers 1) DNA replication begins at the ori site
2) Replicated DNA segregates to either end of the cell
3) Cytokinesis produces two cells
