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Biology I : Meiosis
Stuff about Meiosis
Terms in this set (39)
In _______, DNA becomes chromosomes (from Chromatin), ________ appear, the nuclear membrane and _______ disappear, and every chromosome lines up next to its homologue (a process called _______).
Prophase I, Spindle Fibers, nucleolus, Synapsis
In Prophase I, once the homologues are paired, they twist around each other and form a ________ (this word means "______" and refers to the _____ ______ that compose the 2 chromosomes.
Tetrad (means "four", refers to the 4 chromatids)
As tetrads form in prophase I, portions of _______ may be exchanged - either between the 2 _______ or between ________ chromatids (this is called _______-______ and results in the exchange of __________)
DNA, chromosomes or between sister chromatids, crossing-over, genes
In ________, the tetrads (groups of _______ chromosomes) are moved to the _______ of the cell by spindle _______ (_______). Homologous pairs of ________ remain together.
Metaphase I, 2 chromosomes, center, fibers, (Kinetochore), chromosomes
In ________, The _______ pairs of chromosomes separate. One chromosome of each pair is pulled to the ________ of the cell by the ______ fibers. (Each chromosome is still composed of 2 ________ joined by a _________)
Anaphase I, Homologous, pole, kinetochore, chromatids, centromere
In _________, the ________ divides, forming 2 ______ cells.
Telophase I, cell, new
Draw the diagram for Prophase I ----> Telophase I, then check your notes to see if you did it right.
DID YOU DO IT RIGHT????
A homologous pair is a pair of chromosomes that ___________
code for the same trait
meiosis II occurs after ________
Meiosis I produced _______ new ______ cells. These 2 new cells now undergo Meiosis II
2 new daughter cells
How many phases does Meiosis II have?
4, same as Meiosis I
___________ : New _______ fibers form; the nuclear membrane that had reformed in _________ _______ now disappears
Prophase II; Spindle fibers, Telophase I
________ : Chromosomes are moved to the center of the cell by the ___________ ________ (In Metaphase I, ______ of chromosomes were moved to the center . . . at this point in cell division there are no longer ______)
Metaphase II; Kinetochore fibers, pairs, in pairs
pairs of chromosomes that twist together are known as ________
___________ : ________ joining the chromatids divide and free each sister chromatid from the other. Then the separated sister ___________ move toward opposite ends of the cell (this movement is caused by the ______ fibers)
Anaphase II; the centromeres, chromatids, kinetochore
____________ : ________ fibers dissolve, nuclear membrane reforms, the_________ uncoil into __________, and ___________ occurs
Telophase II; Spindle, chromatids, chromatin, cytokinesis
Draw the diagram for Prophase II ------> Telophase II, then check your notes to see if you got the right answers
Well??? Did you?
Result of Meiosis : the resulting gametes (_________ or _______) have only half the number of chromosomes as the original parent cell. Thus the gametes are described as being ____________
(Sperm or Egg), described as being Haploid
What is the creation of reproductive cells referred to as?
What are male reproductive cells called?
What are female reproductive cells called?
Gamete cells are formed by ___________.
Meiosis produces __________ in males, or ____________ in females.
4 functional sperm in males, or 1 functional egg in females
Draw/Label a sperm diagram thing and then check your notes.
There should be a head, a neck, and a flagellum/tail
What is the head of a sperm cell made up of?
DNA and cytoplasm
What is the neck of a sperm cell made up of?
The more mitochondria a sperm cell has, ___________.
the more speed it has
What is a sperm cell's flagellum (tail) formed from?
What is a functional egg called?
1N = _____
2N = _____
1N = Haploid
2N = Diploid
1N Sperm + 1N Egg ----->
2N Zygote (mitosis begins)
Draw/Label the egg diagram thing and then check your notes.
there should be three polar bodies and one ootid/functional egg
The cell before the sperm is formed is called a ________
From what structures are the sperm's tails formed?
microtubles (also found in the cytoplasm)
a pair of chromosomes, one from each parent, that have relatively similar structures and gene values
homologous pair of chromosomes
where are homologous pairs found in meiosis?
Prophase or Metaphase I (in the tetrads)
Where are diploid cells found in Meiosis?
The very beginning, before prophase I begins
What are the phases of Meiosis I?
Prophase I, Metaphase I, Anaphase I, Telophase I
What are the phases of Meiosis II?
Prophase II, Metaphase II, Anaphase II, Telophase II
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THIS SET IS OFTEN IN FOLDERS WITH...
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