-
Division of eurkaryotic cells into two identical cells is called?
Mitosis
-
Mitosis and meiosis are divisions of the?
Nucleus and chromosomes
-
What kinds of cells are not associated with meiosis?
somatic cells (body cells)
-
What are chromatids that are attached at the centromere called?
sister chromatids
-
What are proteins called that resemble spools on which DNA molecules are wound?
histones
-
What are portions of a DNA molecule wound around a spool of histone protein called?
Nucleosome
-
What is the number of DNA molecules in a duplicated chromosome?
2
-
What is unique about chromosomes in a eukaryotic cell?
the number of chromosomes is the same for all members of a species
-
When does DNA replication occur?
between the gap phases of interphase
-
When are chromosome and genes replicated?
Interphase
-
During what stage of the cell cycle are chromosomes duplicated?
Sphase
-
What is the interval before the onset of DNA
replication called?
G1 phase
-
What is the stage just preceding nuclear and
cytoplasmic division?
G2 phase
-
How many sister chromatids are present after duplication?
40
-
If a parent cell has 20 chromosomes, then each
daughter cell will have how many chromosomes?
20.
-
What are cells called with two of each kind of
chromosome
diploid
-
The spindle apparatus composed of what
microtubules
-
When does the spindle apparatus begin to become
visible
Prophase
-
When are the chromosomes aligned at the spindle
equator
Metaphase
-
When do the chromatids detach from one another
and become visibly separate chromosomes
Anaphase
-
When do chromosomes move to opposite poles
Anaphase
-
When do chromosomes arrive at opposite poles
Telophase
-
When does the nuclear membrane reform
Telophase
-
What are the correct stages of mitosis in order
PMAT
-
When is the distribution of cytoplasm to
daughter cells accomplished
cytokinesis
-
What is the tissue mass called that forms when
cells do not respond to normal controls over growth and division
tumor
-
What are unusual growths of cells that do not
pose a threat to surrounding tissues called
benign
-
What is the spread of cancer from one site to
another in the body called
metastasis
-
What are some typical sites for the occurrence
of meiosis
ovaries
-
What does sexual reproduction result in
new combinations of genetic traits
-
What are alleles
different forms of the same gene
-
What are some things that happen during meiosis
- -genes are shuffled
- -parental DNA is divided and distributed to forming gametes
- -diploid chromosome # is reduced to haploids
- -offspring are provided with new gene combinations
-
Chromosomes of a pair of homologous chromosomes
may differ from other chromosomes in terms of what
size, shape, alleles they carry, postition of the centromere
-
In meiosis, when do sister chromosomes separate
from each other
Anaphase II
-
Know what the different stages of mitosis and meiosis look like.
page 147, pg 164, pg 158
-
When does crossing over occur
Prophase I
-
Which phase of meiosis will the chromosomes
appear as packets of four chromatids
Prophase I
-
In anaphase, what are the chromosomes beginning
to do
chromosomes move apart
-
In what stage are paired homologous chromosomes
found at the equatorial plate
Metaphase I
-
How many molecules of DNA are present in a
developing human sperm cell at the beginning of prophase I
92
-
When does major gene reshuffling take place
Prophase I
-
What ultimately happens to sister chromatids of each chromosome during meiosis II
sister chromatids are seperated from each other
-
How many haploid cells are the result of meiosis
4
-
Know what the end products of oogenesis and spermatogenesis
are called
4 sperm, lovum and 3 polar bodies (pg. 163)
-
When does pairing of homologues occur in meiosis
Prophase I
-
During what phase do homologues separate
Anaphase I
-
What are examples of haploid cells? What is an
example of a diploid cell
- Haploid: spore, egg, sperm, gametophyte.
- Diploid: Zygote
-
Know the order of stages in reproduction and
development
Gamete, Fert, Cleavage, Gastrulation, organ formation, growth
-
What is a single-layered, fluid-filled ball of
cells called
Blastula
-
What process produces the blastula
Cleavage
-
What process produces an embryo with primary
tissue layers
Gastulation
|
|
