meiosis Flashcards
what kind of cells does meiosis produce
haploid cells
what happens in prophase 1
- chromatin condenses into chromosomes, the spindle apparatus forms and the nucleoli and nuclear membrane disappear
- homologous chromosomes come together and intertwine in a process called synapsis
- crossing over occurs
what happens in metaphase 1
-homologous pairs align at the equatorial plane and each pair attaches to a separate spindle fiber at the kinetochore
what happens in anaphase 1
-homologous pairs separate and are pulled to opposite poles of the cell (disjuction)
what happens during disjunction
the paternal chromosome separates from its homologue of maternal origin and either chromosome can end up in a daughter cell
when does nondisjunction occur
when cells don’t separate appropriately during meiosis
what is the result of nondisjunction
daughter cells have an incorrect number of chromosomes
what happens in telophase 1
nuclear membrane forms around each nucleus
what happens in the second meiotic division
chromosomes aligns at the equator, separate and move to opposite poles and are surrounded by a re-formed nuclear membrane
is meiosis 2 preceded by chromosomal replication
no