Mitosis And Meiosis Flashcards
Because daughter cells contain both members of each chromosome pair (total of 46), they are called
Diploid
Meiosis involves two cycles of cell division and produces
Four cells
Each contain 23 individual chromosomes (n=23)
These cells are called haploid cells and contain one member of each pair of chromosomes.
As cells prepare to begin meiosis
DNA replication occurs within the nucleus.
Each chromosomes now consist of two duplicate chromatids
In meiosis, the corresponding maternal and paternal chromosomes come together in an event known as
Synapsis
Synapses involves
23 pairs of chromosomes, and each member of each pair consists of two chromatids
Tetrad
A matched set of four chromatids
Crossing over
The stage of meiosis, some genetic material can be exchanged between the chromatics of a chromosome pair.
The nuclear envelope disappears at the end of
Prophase 1
As anaphase one begins
The tetrads break up–The maternal and paternal chromosomes separate
A major difference between mitosis and meiosis
In mitosis, each daughter cell receives a copy of every chromosome, maternal and paternal
in meiosis one each daughter cell receives two copies of either the maternal chromosome or the paternal chromosome
As anaphase 1 proceeds
Each tetrad splits, the maternal and paternal the components are randomly distributed
Telophase 1 ends with the formation of
Two daughter cells containing unique combinations of maternal and paternal chromosomes. Both cells contain 23 chromosomes.
The first meiotic division is called a reductional division because
It reduces the number of chromosomes from 46 to 23.
Each of these chromosomes still consists of two duplicate chromatids.
the duplicates will separate during meiosis 2
The interphase between meiosis 1 and meiosis 2
- Is very brief
2. No DNA is replicated
After the interphase each cell proceeds through
Prophase 2
Metaphase 2
Anaphase 2
Telophase 2
