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Meiosis & Mitosis
Cell replication, mammal reproduction & cell growth and repair
45
Biology
9th Grade
11/28/2012

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Term
Heredity
Definition
the passing on of characteristics from parents to offspring.
Term
gametes
Definition
male and female sex cells.
Term
fertilization
Definition
the process of the male gamete uniting with the female gamete.
Term
zygote
Definition
the fertilized cell of a male and female gamete.
Term
alleles
Definition
alternate forms of genes
Term
diploid
Definition
a cell with two of each kind of chromosome.
Term
haploid
Definition
a cell containing one of each kind of chromosome.
Term
homologous chrromosomes
Definition
Are the two chromosomes of each pair in a diploid cell.
Term
meiosos
Definition
The division of cells that produce gametes containing half the number of chromosomes as their parents.
Term
sexual reproduction
Definition
the pattern of reproduction, involving the production and subsequent fusion of haploid sex cells.
Term
crossing over
Definition
the breaking and exchanging of genetic materials. Crossing over can occur at any location on a chromosome, and several locations at the same time.
Term
metaphase
Definition
the centromere of each chromosome becomes attached to a spindle fiber.
Term
Anaphase
Definition
Homologous chromosomes each with its two chromatids, separate and move to opposite ends of the cell.
Term
telophase
Definition
The spindle is broken down the chromosomes uncoil, and the cytoplasm divides to yield two new cells.
Term
non-disjunction
Definition
Is the failure of homologous chromosomes to separate property during meiosis.
Term
chromosomes
Definition
cell structures that carry the genetic material that is copied and passed from generation to generation.
Term
interphase
Definition
cell growth phase where a cell increases in size, carries on metabolism, and duplicates chromosomes prior to division
Term
karyotype
Definition
a chart of metaphase chromosome pairs arranged accouding to length and location of the centromere; used to pinpoint unusual chromosome numbers in cells.
Term
genetic variability
Definition
is the end process of the reassortment or crossing over among organisms during meiosis
Term
mitosis
Definition
period of nuclear cell division in which two daughter cells are formed, each containing a complete set of chromosomes.
Term
sex chromosome
Definition
in humans, the 23rd pair of chromosomes determine the sex of an individual and carry sex-linked characteristics
Term
How is the sex determined in animals
Definition
a female will have an XX chromosome and a male will have an XY chromosome
Term
Purpose of Mitosis
Definition
To allow cell growth, the repair, and reproduction of a cell. The end cell is a duplicate to the beginning cell.
Term
Purpose of meiosis
Definition
to reduce genetic material for gamete reproduction, end cell divides into 4 daughter cell. half from female half from male
Term
mitosis occurs where?
Definition
within the body on cellular level
wherever repair, growth, or reproduction of that specific area is needed (liver, kidneys, brain, heart, etc.
Term
Where does meiosis occur?
Definition
within the somatic cells of humans
Term
How many division does Mitosis take?
Definition
one division
Term
what are the phases of mitosis
Definition
prophase, metaphase, anaphase, and telophase
Term
what are the phases of mitosis
Definition
prophase, metaphase, anaphase, and telophase
Term
end number of cells through mitosis
Definition
2 identical sister cells
Term
genetic similarity of new cells through mitosis
Definition
they are very alike or exact replicas
Term
what is the end number of chromosomes
Definition
the same number before it began
Term
Where does meiosis occur
Definition
within somatic cell of humans
Term
How many division are in meiosis
Definition
(2) Meiosis I and Meiosis II
Term
End number of cells in meiosis
Definition
4 daughter cells ALL HAPLOID
1 set of chromoomes (sex cells)
Term
genetic similarity of new cells after meiosis
Definition
the new cell has 1/2 of the mother chromosomes and l/2 the father chromosomes THEY ARE DIFFERENT
Term
The end number of chromosomes after meiosis
Definition
23
Term
how many number of DNA replications are in meiosis
Definition
1 during interphase
Term
What is amniocentesis?
Definition
Also known as Amniotic Fluid Test it is a test during pregnancy that detects chromosomal abnormalties in the growing fetus.
Term
Somatic cell
Definition
is any biological cell forming the body of an organism that is not a gamete.
Term
What do the terms N and 2N mean for mitosis
Definition
2N before and after mitosis DIPLOID
Term
What do the terms N and 2N mean in meiosis
Definition
cells before meiosis are 2N but turn to N after meiosis and are HAPLOID
Term
prophase
Definition
The DNA of the chromosome coils up and a spindle forms.
Term
Syndromes caused by non-disjunction
Definition
Down Syndrome the child has 47 chromosomes instead of 46.
Turner Syndrome the child has only 1 X chromosome instead of 2.
Term
What is the biological benefit of reproduction.
Definition
The reassortment of chromosomes and the genetic information they carry is a major source of variation and keeps them healthy and unique.
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