Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What is most cell division in the body?
|
Mitosis is most of this division in the body.
|
|
|
How much of a reduction in chromosome number happens with mitosis?
What's the formula? |
No reduction in # of these.
2N --> 2N |
|
|
What form of cell division creates no exchange of DNA between chromosomes?
|
Mitosis creates this much exhange of DNA.
|
|
|
What does Meiosis produce?
|
This produces germ cells.
|
|
|
What is another name for GERM CELLS?
|
Haploid (1N) gametes is another name for these.
|
|
|
What are the two germ cells in humans?
|
1. egg
2. sperm are the two of these |
|
|
How much of a reduction of chromosomes occurs with meiosis?
What's is called? What's the formula? |
This cells division reduces chromosomes by half.
Called "reductive division" diploid --> haploid 2N --> 1N |
|
|
How many 1 N daughter cells does a 2N cell produce?
|
This produces four 1 N daughter cells.
|
|
|
In humans, how many chromosomes does a 2N have?
1N? |
2N = 46
1N = 23 |
|
|
What form of cell division has exchange of DNA?
|
Meiosis can have exchange of this.
|
|
|
What is the exchange of DNA called?
|
The exchange of this is called "crossing over".
|
|
|
How many divisions does MEIOSIS involve?
What are they? |
MEIOSIS involves two of these
1. Meiosis I 2. Meiosis II |
|
|
What are the four phases of Meiosis I in order?
|
1. Prophase I
2. Metaphase I 3. Anaphase I 4. Telophase I are the four parts of this |
|
|
How many homologous chromosomes line up in Prophase I?
What do they form? |
2 Homologous chromosomes line up to form a TETRAD in this phase.
|
|
|
What is a tetrad?
|
This is four identical chromotids.
|
|
|
What step starts crossing over? What does that increase in a species?
|
Prophase I starts this exchange.
It increases genetic variation within a species. |
|
|
What happens in Metaphase I?
(What's involved? Where do they go?) |
Pairs of homologous chromosomes line up at metaphase plate.
|
|
|
What happens to homologous chromosomes during Anaphase I?
|
During this phase, homologous chromosomes separate.
|
|
|
What's different about Anaphase I in meiosis and mitosis?
|
Chromatids do not separate as in MITOSIS.
|
|
|
What forms is Telophase I?
|
In this phase, nuclei form.
|
|
|
What does one 2N nuclei in Telophase I?
|
One of these cells is now two 1N nuclei.
|
|
|
What stage of MEIOSIS is most like MITOSIS?
|
MEIOSIS I is most like this type of cell division.
|
|
|
During what phase is each chromosome consisting of 2 chromatids?
|
During prophase II each chromosome consists of these.
|
|
|
During what phase do chromosomes line up?
Where? |
During Metaphase II, chromosomes do this at the metaphase plate.
|
|
|
During what phase do sister chromatids separate?
Where? Where do they move? |
During ANAPHASE II, these separate at centromeres.
The chromatids move to opposite poles. |
|
|
What is each chromatid during ANAPHASE II?
|
Each chromatid is now a single-stranded chromosome.
|
|
|
What forms in Telophase II?
|
The nuclear envelope forms during this phase.
|
|
|
During Telophase II, what does each of the two 1N nuclei form?
For a total of how many 1N nuclei? |
Each of the two of these has now formed two 1N nuclei for a total of four 1N nuclei.
|
|
|
How many 1N nuclei eventually form from a single 2N nuclei?
|
This will eventually form FOUR 1N nuclei.
|
