Biology Forum › Cell Biology › Meiosis division
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- April 9, 2012 at 12:39 pm #16336
ALevelBioParticipantHi, i am struggling to grasp the AS level meiosis concept. Now i know in Mitosis the DNA replicates so that we have 72 that divides into two cells with 46, which is two Diploid cells.
In meiosis i believe that DNA replication occurs, making 72 which then divides into 46 in two cells. These cells have the crossed over bivalent pairs. But from what i have read it is said that after this first division there are 2 haploid cells? How can this be if there are 2n chromosomes in each?
I need a helpful summary of what happens so i can understand!Thanks
- May 12, 2012 at 8:27 pm #111039JackBeanParticipant
There are two subsequent divisions with only one preceding replication. Thus, in the beginning you have 2n cell, replication -> 92 alleles -> 1st division = 46 alleles (2n) -> 2nd division = 23 alleles (1n)
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