meiosis Flashcards
karyotypes
chromosome pairs ordered by size and length
autosomes vs sex chromosomes
auto: do not determine sex (humans 22 pairs)
sex: eggs (X), sperm (X or Y)… 22 + X/Y
meiosis characteristics
forms gametes
2 divisions
results in 4 haploid cells
3 events in meiosis
prophase I
metaphase I
anaphase I
meiosis I
occurs after interphase
prophase I: homologous chromosomes pair to form tetrad, DNA is exchanged
metaphase I and anaphase I
meta: tetrads line up at metaphase plate
ana: pairs of homologous chromosomes seperate
telephase I and cytokinesis
nuclei and cytoplasm splits
no interphase after to decrease # of chromosomes
prophase II
no crossing over
spindle forms
metaphase II
chromosomes,es line up at the metaphase plate
anaphase II
sister chromatids separate and move towards opposite poles
telephase II & cytokinesis
4 haploid cells
each daughter cell is genetically unique
