Meiosis: biology

Sex Cells
in what type of cell does division take place in Meiosis?
Gameets
Sex cells are also reffered to as….?
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Body Cells
in what type of cell does division take place in Mitosis?
Growth and repair
What is the purpose of division in MItosis?
reproduction
What is the purpose of division in Meiosis?
46
How many chromosomes fare present at G1 in MItosis??
46
How many chromosomes fare present at G1 in Meiosis?
92
How many chromosomes are present at G2 in Mitosis?
92
How many chromosomes are present at G2 in Meiosis?
One
How many divisions are there in MItosis?
Two
How many divisions are there in Meiosis?
Review G1 and G2 for chromosomes in meiosis and Mitoisis…
Mitosis: 2 Meiosis: 4
How many daughter cells are produced in MItosis Vs Meiosis?
Mitosis: Diploid Meiosis: Haploid
How many Chormomsomes are in the daughter cells in Mitosis vs Meiosis?
Diploid ; Haploid
2n=? and n=?
Mitosis: Identical Meiosis: Different
Are the daughter cells identical to or different than parent than the parent cell in MItosis Vs Meiosis?
Mitosis: No Meiosis: yes, Prophase I
Does crossing over occur? if so during what stage in Meisosis Vs Mitosis?
Mitosis: Anaphase Meiosis: Anaphase II
During what stage do the sister Chromatids Seperate in Mitois Vs Meiosis?
1) each organism must inherit a single copy of every gene from both its parents
2) when an organism produces itw own gametes those two set of genes must be seperated from each other so that each gamete contains just one set of genes
List the two things that Medels princiles of gentics required in order to be true?
that each of the chromosomes that came from the male parent has a corrosponding chromosome from the female parent
what does it mean when two sets of chromosomes are homologous?
2N, and contains two sets of homologous chromosomes
name two ways to describe a diploid cell
4
if a Drosophilla cells has a diploid number of 8 how many chromosomes will be in the haploid?
study the drawings of Meiosis
because the number of chromomsomes per cell is cut in half through the seperration of homologous chromosomes in a diploid cell
why is meiosis described as a process of reduction division?
Meisosis I and Meisosis II
what are the two distinct divisions of Meiosis?
true
T/F? the diploid cell that enters meiosis becomes 4 haploid cells at the end of meiosis?
each chromosome pairs with its corrosponding homologous chromosomes and produces new combinations of alles
how does a tetrad form in prophse I of meiosis?
True
T/F about Meiosis? during meiosis I homologous chromosmoes seperate
False
T/F about Meiosis? the two daughter cells produced by meiosis I still have the two complete setes of Chromosomes
true
T/F about Meiosis? during anaphase II the paired chromadids seperate
false
T/F about Meiosis? after meiosis the four daughter cells contain the diploid number of chromosomes?
Sperm
Haploid gametes produced in males?
Eggs
Haploid Gametes produced in Females?
Polar boddies
Cells produced in femalse that do not participate in reproduction?
False
t/f about meiosis and mitosis? mitosis produces four genetically different haploid cells?
False
t/f about meiosis and mitosis? meiosis produces two genetically identical diploid cells?
True
t/f about meiosis and mitosis? Mitosis begins with a diploid cell?
True
Meiosis begins with a diploid cell?
homologous
term used to refer to chromosomes that each have a corrosponding chromosome from the opposite sex parent
Diploid
refers to a cell that contains both sets of homologous chromosomes
Haploid
refers to a cell that contains only a single set of chromosomes and therefor only a single set of genes
proccess by which the number of chromosomes per cell is cut in half through the seperation of the homologous chromosomes in a diploid cell
deff of meiosis is?
tetrad
structure containing four chromatids that form in meiosis
crossing over
process in which homologous chromosomes exchange portions of their chromatids during meiosis
look over notes
read section 11-4 aloud…
cell division (bacteria)
Asexual reproduces by…
Meiosis
sexual reproduces by…
Diploid
a cell that contains both sets of homologous is said to be a …?
meiosis
the normal chromosome number of each species is kept constant by…?
I: each chromosome pairs with its homologous chromosome (called tetrad), and crossing over begins in the homologous pairs >>>> II: the nuclear envelope disappears and each cell has half the chromosome #
give a brief discription of prophase I and prophase II?
Synapsis
the close contact b/ween chromosome pairs is caled…?
I: homologous chromosomes line up in the middle of the cell. >>>> II: chromosomes line up at the equator
give a brief discription of Metaphase I and Metaphase II?
I: Homologous chromosomes are seperated and begin moving to opposite poles >>> II: sister chromatids are seperated and begin to move to the poles
give a brief discription of of Anaphase I and Anaphase II?
I: the nuclear envelope forms and cytokinesis takes place resulting in 2 haploid cells >>>> II: the nuclear evelope fors and cytokinesis occurs resulting in four genetically different haploid cells
give a brief discription of Telaphse I and Telaphase II?
Prophase I and Anaphase I
what are the tow signifigant differences from meiosis and mitoisis with in the stages?
cytokinesis
the main difference b/ween egg and sperm formation occurs during ….?
4 ; 1
a male has _ haploid sperm cells and a female has _ Haploid egg cells?
oogenesis
the cytooplasm divides unequalley during…?
one haploid ootid and 3 polar bodies
oogenessi results in …?
Fetilization
process in sexual reproduction in which male and female reproductive cells join to form a new cell
zygote
fertilized egg
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