<P> Chromosome segregation occurs at two separate stages during meiosis called prophase I and prophase II ( see meiosis diagram ) . In a diploid cell there are two sets of homologous chromosomes of different parental origin ( e.g. a paternal and a maternal set ) . During the phase of meiosis labeled `` interphase s '' in the meiosis diagram there is a round of DNA replication , so that each of the chromosomes initially present is now composed of two copies called chromatids . These chromosomes ( paired chromatids ) then pair with the homologous chromosome ( also paired chromatids ) present in the same nucleus ( see prophase I in the meiosis diagram ) . The process of alignment of paired homologous chromosomes is called synapsis ( see Synapsis ) . During synapsis , genetic recombination usually occurs . Some of the recombination events occur by crossing over ( involving physical exchange between two chromatids ) , but most recombination events involve information exchange but not physical exchange between two chromatids ( see Synthesis - dependent strand annealing ( SDSA ) ) . Following recombination , chromosome segregation occurs as indicated by the stages metaphase I and anaphase I in the meiosis diagram . </P>
<P> Chromosome segregation occurs at two separate stages during meiosis called prophase I and prophase II ( see meiosis diagram ) . In a diploid cell there are two sets of homologous chromosomes of different parental origin ( e.g. a paternal and a maternal set ) . During the phase of meiosis labeled `` interphase s '' in the meiosis diagram there is a round of DNA replication , so that each of the chromosomes initially present is now composed of two copies called chromatids . These chromosomes ( paired chromatids ) then pair with the homologous chromosome ( also paired chromatids ) present in the same nucleus ( see prophase I in the meiosis diagram ) . The process of alignment of paired homologous chromosomes is called synapsis ( see Synapsis ) . During synapsis , genetic recombination usually occurs . Some of the recombination events occur by crossing over ( involving physical exchange between two chromatids ) , but most recombination events involve information exchange but not physical exchange between two chromatids ( see Synthesis - dependent strand annealing ( SDSA ) ) . Following recombination , chromosome segregation occurs as indicated by the stages metaphase I and anaphase I in the meiosis diagram . </P>
when does segregation and independent assortment happen during meiosis
when does segregation and independent assortment happen during meiosis
prophase I prophase II
prophase I prophase II