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Meiosis
steps of meiosis
33
Biology
11th Grade
12/05/2010

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Term
Interphase I
Definition
grow - copy DNA - grow
-diploid: two sets of chromosomes
-Unspecialized Cell
Term
Prophase I
Definition
Spindles form, nuclear envelope dissolves, chromatin condense into chromosomes. Synapsis (Homologous chromosomes pair up with tetrad
Term
Metaphase I
Definition
Tetrad line up in the middle and attach to the spindle
Term
Anaphase I
Definition
Tetrads separate and homologous are randomly pulled apart, Independent assortment.
Term
Telophase I
Definition
Nuclear envelope reforms DNA goes back to chromatin. Spindle dissolves
Term
Prophase II
Definition
DNA condenses into chromosomes
-Nuclear envelope breaks down
-centrioles move to opposite ends and help spindle.
Term
Metaphase II
Definition
Chromosomes move to the middle of the cell and attach to the spindle.
Term
Anaphase II
Definition
Chromosomes divide and the halves of the chromatin align to the equitorial plate and held in place by microtubules attached to the spindle.
Term
Telophase II
Definition
Chromosomes uncondense, nuclear envelope reforms, spindle dissolves.
Term
Spermatigenises
Definition
making sperm. 1 cell = 4 sperm
Term
Oogenesis
Definition
making eggs.
- 1 cell = 1 egg and 3 polar bodies (useless)
uneven division.
All eggs in baby are in prophase I.
Female born with 400,000 eggs and release around 300-400.
Term
Chromosomal Mutations
Definition
Chromosomal mutations are caused by changes in a gene
occurs during DNA replication, cell division and after cell division.
Term
Germ Cell
Definition
Mutation that affect sex cell
affects baby of organism
Term
Somatic cell mutation
Definition
Occur in body cells and affect the individual but not the offspring
Term
Lethal mutations
Definition
causes death often before birth
Term
Nondisjunction
Definition
failure of homologous chromosomes to separate
Term
Deletion
Definition
loss of a piece of chromosome
Term
Duplication
Definition
extra copies of part of a chromosome
Term
Inversion
Definition
Breaks off flips and reattaches a part of the chromosome
Term
Translocation
Definition
Part breaks off and attaches to non homologous chromosomes
Term
Insertion or addition
Definition
extra DNA inserted or added
Term
Genotype
Definition
the genetic make up of a cell or organism or individual
Term
Phenotype
Definition
Observable character or trait of an organism
Term
Neutral effect
Definition
no effect
Term
Beneficial effect
Definition
enhance fitness (ability to pass good or bad things)
Term
Deleterious effect
Definition
decrease fitness (ability to pass good or bad things)
Term
LH
Definition
Females stimulate ovulation. Males stimulates making testosterone.
Term
Estrogen
Definition
Females it develops for puberty
Term
FSH
Definition
stimulates the development of follicles in females promotes spermatigenisis in males
Term
Oxytocin
Definition
In females causes contraction of uterus
Term
Prolactin
Definition
Causes lactation in mammary glands in women
Term
Prolactin
Definition
Causes lactation in mammary glands in women
Term
Androgen
Definition
Male sex hormone
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