Meiosis II Flashcards
meiosis ii starts with?
2 haploid cells.
there are how many chromosomes per daughter cell?
23.
due to independent assortment, there is?
a random distribution of genetic material. this means that some maternal chromosomes will have gone into one cell and in some cases the paternal chromosome went into another cell.
due to the formation of chiasmata?
each maternal/paternal chromosome will have unique pieces of dna depending on where the crossing over occurred.
- each haploid cell will have a different mixture of dna
what happens in prophase ii?
- centrosome replicates
- spindle apparatus forms in each cell
what happens in metaphase ii?
sister chromatids line up at the metaphase plate.
what happens in anaphase ii?
- sister chromatids are separated.
- each chromatid begins to move to opposite ends of the cell.
what happens in telophase ii/cytokinesis ?
- chromosomes are at opposite ends
- nuclear envelope forms
- cell divides
at the end of meiosis ii?
4 haploid cells have been made, each with 23 chromosomes. these are called gametes.
how does genetic variation among offspring arise?
independent assortment of chromosomes which occurs in metaphase i.
on average, how many crossovers?
1-3 crossover events per chromosome pair. happens in prophase i
genetic diversity arises due to?
independent assortment, crossing over, and random fertilization
what is the purpose of meiosis?
the primary purpose of meiosis is to produce gametes: sperm and eggs, with half the number of chromosomes as the parent cell.
where does meiosis occur?
in the gonads: ovaries, testes
are the haploid cells identical?
no they are all non identical cells.
