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Sexual Reproduction

QuestionAnswer
Cell division G1 and G2 phase this is when a cell doubles in organelles and cytoplasm...cell growth
S Phase DNA replicaton occurs, cells entering ths phase have twice as much DNA than in the other phases
M phase mitotic cell phase, the cell divides in two. Contains prophase, metaphase, anaphase and telophase
Mitosis this celluar division produces two diploid daughter cells that are genetically identical
Meiosis produces daughter cells that contian half the genetic material
Diploid cells contains two copies of every chromosome, forming a pair of homologous chromosomes
homologous chromosomes contain genetic information from both parents
Mitosis: Prophase First the nucleoli disappears and the chromatin condense. Then the nuclear envelope breaks down, lastlymitotic spindle is assembled
Mitosis: Metaphase Sister chromatids align on metaphase plate
Mitosis: Anaphase Chromosmoes separate into chromatids. Microtubules connect to chromatids (now chromosomes), shorten and pulls them to opposite polls. Lastly formation of cleave furrow.
Mitosis: Telophase New nuclear envelope develops around each pole forming two nuclei. Cytokineis occurs
diploid two copies of each chromosome = 46
Prophase I Nucleolus disappears, chromatin condense into chromosomes, envelope starts to break down. Homologous chromosomes pair up forming tetrads, crossing over occurs.
Metaphase I homologous pairs of chromosomes are spread across the metaplate
Anaphase I Homologous chromosomes separate, and sister chromatids remain together
Telophase I Cell divides into two cells. At this point the cells are considered to be haploid
Prophase II Nuclear envelope disappears and the spindle developes
Metaphase II Chromosomes allign on metaphase plate centromeres divid, leaving pairs of sister chromatids
Anaphase II Sister chromatides pulled to opposite polls by spindle fibers
Telophase II Nuclear membrane forms around eahc new cucleous. Four halpoid cells have been produced.
nondisjuncton failure to separate during meosis
Created by: studypants on 2009-08-17



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