Meiosis and Binary Fission
• Binary Fission: Cell division in prokaryotes,
that copy their DNA, a membrane forms
around it and two new cells are formed.
• In prokaryotes, cell division is less difficult for
– Less complex, specially with bacteria with one cell,
and the DNA is Circular!
• Also, Their DNA is less complex, so cell division is less
• Binary Fission is not Mitosis!!
• Meiosis: The division of Diploid cells into
– This is crucial for gamete cells in eukaryotes.
• What are gametes?
– The reason why, is because it starts out to be
• Meiosis is extremely important because it creates
genetic diversity within species.
– Mitosis creates identical cells
• These are body cells
– Meiosis creates genetically different cells
• These are sex chromosomes.
• Meiosis goes through the same steps as Mitosis
but it repeats itself.
– And it has two different types of chromosomes.
• One from father and the other from mother.
Steps of Mieosis
• 8 steps!
– Prophase I
– Metaphase I
– Anaphase I
– Telophase I
– Prophase II
– Metaphase II
– Anaphase II
– Telophase II
Steps Of Meiosis
• Each stage is the same as Mitosis except that
you have two sets of chromosomes!
• And it repeats itself until it has four haploid
• During Prophase I, The chromosome will
– Crossover- is when Chromotids from a
chromosome will break off and switch
• They also form Oogensis
– Formation of egg cells
• It also forms Sperm cells through the process