Meiosis Flashcards
(21 cards)
purpose of meiosis is to
produce gametes
prophase 1
crossover/exchange of chromosomal info between homologous chromosomes
metaphase 1
gets ready to separate (independent assortment)
- doesn’t separate centromeres
during metaphase 1
kinetochores attach to same pole
anaphase 1
- some crossing over
- no centromere split
telophase 1
- nucleus reforms
- cells start cytokinesis
crossing over is
the physical exchange of regions of chromatids between sister chromatids
importance of crossing over
genetic diversity
which traits are more likely to be exchanged
the traits on the end
No DNA replication in meiosis results in
the reduction of chromosome # from diploid to haploid
the chromosomes # is reduced from diploid to haploid because
there is no DNA replication in meiosis because
prophase 2
- nuclear envelope disappears
- spindles formme
metaphase 2
chromosomes align on the metaphase plate
anaphase 2
sister chromatids are separated
telophase 2
nuclear envelope re-forms
- cytokinesis follows
meiosis produces — cells
haploid that are not identical
gamete
egg and sperm cells
haploid
1 set of chromosomes that have half of the genetic information
synapsis
homologues become closely associated with each other
when does synapsis occur
meiosis 1
during crossing over…
when forming a connection they trade equal parts
