Bio 181 Exam with all Correct & 100% Verified Answers
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what is binary fusion? ✔Correct Answer--The chromosome replicates (beginning at the origin of
replication) and two daughter chromosomes actively move apart
In what kind of organisms does binary fission occur? ✔Correct Answer--Prokaryotic cells and
unicellular protozoa (only some, not all)
What are the roles of mitosis? ✔Correct Answer--Growth, reprodution, and Damage repair
In which cells mitosis occurs? ✔Correct Answer--root and shoot apices of plants, In eukaryotes,
Somatic cells (vegetative cells)
What are the phases in mitosis? ✔Correct Answer--prophase, prometaphase, metaphase,
anaphase, telophase
What happens during prophase of mitosis? ✔Correct Answer--nuclear envelope degenerates,
nucleus disappears, chromosomes become condensed
What happens during prometaphase of mitosis? ✔Correct Answer--DNA condenses, nuclear
envelope degenerates, spindle fibers tighter, polar fibers extend from the poles to true equatorial
plate
What happens during metaphase of mitosis? ✔Correct Answer--chromosomes have moved to the
center of the cell, chromosomes align in single file on the metaphase plate
What happens during anaphase of mitosis? ✔Correct Answer--DNA is duplicated allowing
chromosomes to separate, chromatids separate, migrate to separate poles (own daughter
chromosomes), fibers shorten
What happens during telophase of mitosis? ✔Correct Answer--completes mitosis, a membrane
forms around each set of chromosomes, nuclei reappears, spindle fibers disappear, chromosomes
uncoil (invisible again), two daughter cells interphase
What is cytokinesis? ✔Correct Answer--follows mitosis, cell divides into two daughter cells
How does cytokinesis occur in a plant cell? ✔Correct Answer--plate formation
How does cytokinesis occur in an animal cell? ✔Correct Answer--cleavage
What are sister chromatids? ✔Correct Answer--joined copies of the original chromo-
some
What happens during interphase? ✔Correct Answer--a cell grows by producing proteins and
cytoplasmic organelles, duplication of chromosomes
When does interphase occur? ✔Correct Answer--before mitosis
, Are the daughter cells produced by mitosis identical or different? ✔Correct Answer--identical
What happens when the cell cycle control system does not work? ✔Correct Answer--If the cell
does not receive the go-ahead signal in G1 checkpoint, it will exit the cycle, switching into a
nondividing state called the G0 phase
What happens during meiosis I? ✔Correct Answer--the chromosomes split into sister chromatids
What events occur during prophase I of meiosis I? ✔Correct Answer--crossing over occurs
What is the outcome of tetrad formation and crossing over during prophase I of meiosis I?
✔Correct Answer--tetrad is the foursome of chromatids that forms when replicated homologous
chromosomes align. It must be formed for crossing over to occur. after crossing over the chromatid
will contain paternal and maternal segments
How many cells are produced by end of meiosis I ✔Correct Answer--2
What is the chromosome number of each daughter cell after meiosis I? ✔Correct Answer--half of
the original amount
What happens during meiosis II? ✔Correct Answer--the sister chromatids split into 4 daughter
chromatids
What if there was no meiosis? ✔Correct Answer--there would never be genetic variation
What is the role of fertilization in human life cycle? ✔Correct Answer--the sperm fertilizes the egg
to form a zygote
What is the chromosome number of the species Homo sapiens (humans)? ✔Correct Answer--46
Are all human cells diploid? ✔Correct Answer--yes
What are homologous chromosomes? ✔Correct Answer--a chromatid from the paternal and
maternal side
The location of a gene on a chromosome is known as a ___________. ✔Correct Answer--locus
What is the difference between sister chromatids and non-sister chromatids? ✔Correct Answer--
Sister chromatids are two identical copies of a chromatid having the same genes and alleles. in the
non sister chromatid one strand is inherited from its mother while the other one is inherited from its
father.
Why did Mendel use pea plants for his experiment? ✔Correct Answer--they have distinct heritable
features between each characteristic
What are true breeding organisms? ✔Correct Answer--the parents will pass down a specific
phenotypic trait to their offspring (will have a pure genotype)
What is Mendel's first law of inheritance? ✔Correct Answer--law of segregation (Alleles for a trait
are segregated and one of each allele is passed on to each gamete produced by meiosis)
|Guaranteed to Pass |Already Graded A+
what is binary fusion? ✔Correct Answer--The chromosome replicates (beginning at the origin of
replication) and two daughter chromosomes actively move apart
In what kind of organisms does binary fission occur? ✔Correct Answer--Prokaryotic cells and
unicellular protozoa (only some, not all)
What are the roles of mitosis? ✔Correct Answer--Growth, reprodution, and Damage repair
In which cells mitosis occurs? ✔Correct Answer--root and shoot apices of plants, In eukaryotes,
Somatic cells (vegetative cells)
What are the phases in mitosis? ✔Correct Answer--prophase, prometaphase, metaphase,
anaphase, telophase
What happens during prophase of mitosis? ✔Correct Answer--nuclear envelope degenerates,
nucleus disappears, chromosomes become condensed
What happens during prometaphase of mitosis? ✔Correct Answer--DNA condenses, nuclear
envelope degenerates, spindle fibers tighter, polar fibers extend from the poles to true equatorial
plate
What happens during metaphase of mitosis? ✔Correct Answer--chromosomes have moved to the
center of the cell, chromosomes align in single file on the metaphase plate
What happens during anaphase of mitosis? ✔Correct Answer--DNA is duplicated allowing
chromosomes to separate, chromatids separate, migrate to separate poles (own daughter
chromosomes), fibers shorten
What happens during telophase of mitosis? ✔Correct Answer--completes mitosis, a membrane
forms around each set of chromosomes, nuclei reappears, spindle fibers disappear, chromosomes
uncoil (invisible again), two daughter cells interphase
What is cytokinesis? ✔Correct Answer--follows mitosis, cell divides into two daughter cells
How does cytokinesis occur in a plant cell? ✔Correct Answer--plate formation
How does cytokinesis occur in an animal cell? ✔Correct Answer--cleavage
What are sister chromatids? ✔Correct Answer--joined copies of the original chromo-
some
What happens during interphase? ✔Correct Answer--a cell grows by producing proteins and
cytoplasmic organelles, duplication of chromosomes
When does interphase occur? ✔Correct Answer--before mitosis
, Are the daughter cells produced by mitosis identical or different? ✔Correct Answer--identical
What happens when the cell cycle control system does not work? ✔Correct Answer--If the cell
does not receive the go-ahead signal in G1 checkpoint, it will exit the cycle, switching into a
nondividing state called the G0 phase
What happens during meiosis I? ✔Correct Answer--the chromosomes split into sister chromatids
What events occur during prophase I of meiosis I? ✔Correct Answer--crossing over occurs
What is the outcome of tetrad formation and crossing over during prophase I of meiosis I?
✔Correct Answer--tetrad is the foursome of chromatids that forms when replicated homologous
chromosomes align. It must be formed for crossing over to occur. after crossing over the chromatid
will contain paternal and maternal segments
How many cells are produced by end of meiosis I ✔Correct Answer--2
What is the chromosome number of each daughter cell after meiosis I? ✔Correct Answer--half of
the original amount
What happens during meiosis II? ✔Correct Answer--the sister chromatids split into 4 daughter
chromatids
What if there was no meiosis? ✔Correct Answer--there would never be genetic variation
What is the role of fertilization in human life cycle? ✔Correct Answer--the sperm fertilizes the egg
to form a zygote
What is the chromosome number of the species Homo sapiens (humans)? ✔Correct Answer--46
Are all human cells diploid? ✔Correct Answer--yes
What are homologous chromosomes? ✔Correct Answer--a chromatid from the paternal and
maternal side
The location of a gene on a chromosome is known as a ___________. ✔Correct Answer--locus
What is the difference between sister chromatids and non-sister chromatids? ✔Correct Answer--
Sister chromatids are two identical copies of a chromatid having the same genes and alleles. in the
non sister chromatid one strand is inherited from its mother while the other one is inherited from its
father.
Why did Mendel use pea plants for his experiment? ✔Correct Answer--they have distinct heritable
features between each characteristic
What are true breeding organisms? ✔Correct Answer--the parents will pass down a specific
phenotypic trait to their offspring (will have a pure genotype)
What is Mendel's first law of inheritance? ✔Correct Answer--law of segregation (Alleles for a trait
are segregated and one of each allele is passed on to each gamete produced by meiosis)
