The OTHER way to divide. Meiosis Meiosis is another process of cell division. It is very similar to...
-
Upload
dulcie-stevenson -
Category
Documents
-
view
214 -
download
0
Transcript of The OTHER way to divide. Meiosis Meiosis is another process of cell division. It is very similar to...
The OTHER way to divide
MeiosisMeiosis is another process of cell division. It is very similar to Mitosis and shares the
divisional phases.Unlike Mitosis the genetic material being
divided is similar but NOT exactly identical
Mitosis (Short Simple and Sweet)Cell division of Diploid cellsCells that are created are exact copies of the
original.The Mother Cell creates 2 Daughter Cells
with the same amount of Chromosomes (2N) as the original.
Mitosis (Short Simple and Sweet)Interphase consists of 4 Phases: G1, S, G2
and G0 During interphase cell grows in size and
determines if it can begin Mitosis.
Mitosis follows Interphase and consists of 4 Phases: Prophase, Metaphase, Anaphase and Telophase
Mitosis CycleProphase: Chromosomes condense Body
spindles relocate, Nucleus dissolvesMetaphase: Chromosomes align at EquatorAnaphase: Chromatids separate and head to
opposite polesTelophase: Chromatids reach poles and cell
pinches creating two daughter cells
The Stages of Meiosis
Meiosis Meiosis is used during sexual reproduction.Meiosis uses Haploid cells from a mother
and father to create the first human cell.
The mother donates the Oocyte (egg cell)The Father donates the Spermacyte (sperm)
MeiosisMeiosis uses the same 4 Phases as Mitosis but it goes through the division process 2x
Meiosis IProphase, Metaphase, Anaphase, Telophase
Meiosis IIProphase II, Metaphase II, Anaphase II and Telophase II
The Beginning
The Cell begins by combining 23 Chromosomes from the mother (oocyte) and
father (spermacyte)
The Newly developed Cell has 46 Chromosomes (2N) @ Interphase
Prophase
During Prophase the Chromosomes duplicate and join in homologous pairs.
Homologous Chromosomes – Chromosomes of similar size, length and shape that display the same genes.
23 Homologous pairs
ProphaseAfter Joining in Homologous pairs the cells
then begin to Crossover
During Metaphase the Homologous pairs align at the Equator and stick near their matching counterpart.
During Anaphase one of the haploid pairs get pulled to a different pole
During Telophase the chromosomes are enclosed in the nuclear membrane but do not untangle
Meiosis IIFollows shortly behind Meiosis I
The process is similar to mitosis with different genetic results.There is NO Crossover or Chromosome Duplication!!!!The end result is production of four haploid cells (23 chromosomes, N) from the two haploid cells produced in meiosis I.
Crash Course Meiosis