Meiosis Grade 9

Interphase

chromatin replicates and similar strands join to create homologous pairs

prophase I

homologous pair match up and cross over

metaphase I

chromosomes line in homologous pairs across the center of the cell

anaphase I

spindle fibers shorten and pull one double stranded chromosome from each homologous pair to opposite sides of the cell, homologous pairs are separated

telophase I

nucleus reforms cells begin to divide

cytokinesis I

spindle fibers disappear organelles reform 2 cells

interphase II

cell rests, chromosomes NOT replicated

prophase II

spindle fibers reform and attach to double stranded chromosones

metaphase II

chromosones line upo single file across center of cell

anaphase II

double stranded chromosomes get pulled apart, one chromatid goes to each side of the cell

telophase II

nucleus reforms and cell division organelles reform

cytokinesis II

4 haploid gametes

haploid

a cell with half the chromosomes, only one pair

diploid

a cell with the total number of chromosomes, complete set with one from the father one from the mother

homologous pair

matching set of chromosomes, one from the father one from the mother both code for the the same thing genetically

zygote

first body cell new cell formed when gametes join diploid

gametes

sex cells egg or sperm half the amount of chromosomes haploid