Meiosis I© Copyright NewPath Learning. All Rights Reserved. 94-4768Visit www.newpathlearning.com for Online Learning Resources.Prophase IMeiosis starts when the nuclear membrane breaks down, chromatin condenses and the replicated chromosomes become visible. Prophase I - SynapsisHomologous chromosomes move together to form pairs. This is referred to as synapsis. An exchange of DNA segments called crossing-over often occurs during synapsis.Metaphase IThe homologous pairs of chromosomes line up in the center of the cell. attach to each chromosome at the centromere.cross-over occursnucleusnuclear membraneDNA (chromatin) is replicatedcentromerechromosomehomologous chromosome pairspindle fibersparent cellAnaphase IChromosomes from each pair move to opposite sides of the cell. Telophase ITelophase I & Cell Division: A starts to form around each set of chromosomes, and then the cell divides. End of Meiosis IAt the end of meiosis I, two daughter cells are formed, each with only half of the genetic material as the original parent cell.nuclear membranedaughter cellsMeiosis starts when the nuclear membrane breaks down, chromatincondenses and the replicated chromosomes become visible. Homologous chromosomes move together to form pairs. This is referred to as synapsis. An exchange of DNA segments called crossing-over often occurs during synapsis.The homologous pairs of chromosomes line up in the center of the cell.attach to each chromosome at the centromeeeeeeeeeeeeeerrrrrrrrrrrrrrreeeeeeeeeeee.....crosss--------ooooooooooovvvveeeeeeeeeeerrrrrrrrrrrr occursnnnnnnnuuuuuuuuuuuccccccccccllllllllllleeeeusnnnnnnnnnnnnuuuuuuuucclear mmmmmmmmmmmmmmeeeeeeeeemmmmmmmmmmmbbbbbbbbbbbbrrrrrrrrrraaaaaaaaaneDNA (chromatin) is replicatedcccccceeeeeeeeennnnnnnnnnttttttttttttttrrrrrrrrrrrooooooooooooommmmmmmmmmmmmmmmeeeeeeerrrrrrrrrrrrrreeeeeeeeeeeechrommmmmmmmmmmooooooooooosssssssssssoooooommmmmmmmmmmmeeeeeeeeeehomologous chromosome pairspindle fiberspareeeeeeeennnnnnnnnnnnttttttttttttttttt cccccccccceeeeeeeeeeellllllllllllllllllllChromosomes from eacchhhhhh ppppppppppppppppppaaaaaaaaaaaiiiiiiiiiirrrrrrrrrrrrr mmmmmmmmmmmmmmmmmmmooooooooooovvvvvvvvvvvvveeeeeeeee ttttttttto opppppppppppppppppppppppooooooooooooossssssssssssiiiiiiiiittttttttteeeeeeeeeeeeeeeeee sssssssssssssiiiiiiiideesssssssssssssss of the cell. Telophasssseeeeeeeeeeeeeeee I &&&&&&&&&&&&&&&&&&& CCCCCCCCCCCCCCCCeeeeeeeeeeeelllllllllllllllllllll DDDDDDDDDDDDiiiiivvvvvvvvvviiiiiiiiiiiiiisssssssssssssiiiiiiiiiooooooonnnnnnnnn:::::::::: AAAAAAAAAAAAAAAAAAA starts tooooooo fffffffffffffforrrrrrmmmmmmmmmmmmmmmmmmmmmmmm aaaaaaaaaaaaaarrrrrrrooooooooooooooouuuuuuuuuuuuunnndddddddddddd eachhhhhhhh sssssssssssseeeeeeeeeeeeeettttttttt ooooffffffffffff cccccccccccchhhhhhhhhhhhhhrrrrrromoooooooooooooossssssssssssssooooooooooommmeeeeeessssssssssssssss,,,,,,, and then thhhhhhhhhhhhhhheeeeeeeee cccceeeeeeeeeeeeeelllllllllllllllllllllllllllllllllll dddddddddddddddddddddddddiiiiiiiiiiiiiivvvvvvvvvvvviiiiiidddddddddddddeeeeeeeeeeeesssss. Attttt ttttttttttttthhhhhhhhhhhhhhhhhhhheeeeee end of meiosis I, two dauuuuuuuuuuuggggggggggggggghhhhhhhhhhhhhhhhhhhtttttttttteeeerrrrrrrrrrrr cccccccccccccccceeeeeeeeeeeeeeelllllllllllllls are formed, eeeeeeeeeeeeaaaaaaaaaaaaaaccccccccccchhhhhhhhhhh with only half of the genetic maaaaaaatttttttttttteeeeeeeeeeeeerrrrrrrrrrrrrriiiiiiiiiaaaal as the foooooooooooorrrrrrrrrigggggggiiiiiiiiinnnnnnnnnnaaaaaaaaaaaallllllllll pppppppppppppppppaaaarent cell.nuclear membranedaughter cells
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