Phases of meiosis 1
in what phase do sister chromatids no longer become visible?
prophase 1
Diploid cells have __ chromosomes _ from sperm and _ from egg
46, 23 from both
___ Stem Cells come from human embryos.
embryonic
At the end of telophase 2 daughter cells are haploid and genetically _______________ from the parent
different
sperm is created in males via __
and egg is created in females via __
sprematogenesis, oogenesis
T/F Homologous Pairs line up individually at the metaphase plate
F they line up randomly
Meiosis is the process of making ____________________ for sexually reproducing organisms
gametes
____ Stem Cells are harvested from the umbilical cord after childbirth and are used to treat diseases.
cord blood
Chromosomes are _ stranded at the end of Telophase 2
single
Each member of the homologous pair has _____ chromatids
2
In what phase do chromosomes condense, the nuclear envelope and nucleolus break down, spindle forms and chromosomes are now easier to move
prophase 1
Gametes must be what type of cells? _______________ or __________.
haploid or 1n
cells that are used by organs and tissues to replace damaged cells.
Non-Embryonic Stem Cells/tissue-specific/adult stem cells
In prophase 2 Chromosomes condense, the nuclear envelope and nucleolus break down, spindle forms Each daughter cell has _______ chromosomes but each has __ chromatids
23, 2
Non-sister chromatids may become entangled and exchange genetic material in -
crossing over
The Homologous Pairs or tetrad separate and each moves towards a pole in what phase?
anaphase
Meiosis makes sure that the homologous pairs __________________
separate
Undifferentiated cells have not been determined. They can become any type of cell needed by the body.
stem cells
Spindle fibers break down, nucleus and nucleolus reform, and chromosomes relax cytokinesis occurs in what phase
telophase 2
Meiosis gives us genetic variance through __________________ and ____________________
crossing over, genetic variance
If cytokinesis occurs, then there may be a resting phase called:
interkinesis
How is a zygote made?
cells double in chromosome number with each generation when a sperm fertilizes an egg
___ stem cells are found in the bone marrow and make new blood cells. Scientists use them to treat cancer when they perform bone marrow transplants.
Hematopoietic
in anaphase 2 ___________________ divide, ____________________ move to the poles
centromere, chromatids
______________________________ genes create proteins that combine with certain growth factors to prevent the cancer from occurring
tumor suppressing