Biology Unit 3
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Division of eurkaryotic cells into two identical cells is called?
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?
What are proteins called that resemble spools on which DNA molecules are wound?
What are portions of a DNA molecule wound around a spool of histone protein called?
What is the number of DNA molecules in a duplicated chromosome?
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?
During what stage of the cell cycle are chromosomes duplicated?
What is the interval before the onset of DNA
What is the stage just preceding nuclear and
How many sister chromatids are present after duplication?
If a parent cell has 20 chromosomes, then each
daughter cell will have how many chromosomes?
What are cells called with two of each kind of
The spindle apparatus composed of what
When does the spindle apparatus begin to become
When are the chromosomes aligned at the spindle
When do the chromatids detach from one another
and become visibly separate chromosomes
When do chromosomes move to opposite poles
When do chromosomes arrive at opposite poles
When does the nuclear membrane reform
What are the correct stages of mitosis in order
When is the distribution of cytoplasm to
daughter cells accomplished
What is the tissue mass called that forms when
cells do not respond to normal controls over growth and division
What are unusual growths of cells that do not
pose a threat to surrounding tissues called
What is the spread of cancer from one site to
another in the body called
What are some typical sites for the occurrence
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
Know what the different stages of mitosis and meiosis look like.
page 147, pg 164, pg 158
When does crossing over occur
Which phase of meiosis will the chromosomes
appear as packets of four chromatids
In anaphase, what are the chromosomes beginning
chromosomes move apart
In what stage are paired homologous chromosomes
found at the equatorial plate
How many molecules of DNA are present in a
developing human sperm cell at the beginning of prophase I
When does major gene reshuffling take place
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
Know what the end products of oogenesis and spermatogenesis
4 sperm, lovum and 3 polar bodies (pg. 163)
When does pairing of homologues occur in meiosis
During what phase do homologues separate
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
Gamete, Fert, Cleavage, Gastrulation, organ formation, growth
What is a single-layered, fluid-filled ball of
What process produces the blastula
What process produces an embryo with primary
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