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11 Cards in this Set

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identical twins (formed)
-8 cell stage embroy splits in 2 and each develops
-need "reset" so they can give rise to cell types
fraternal twins (formed)
2 seperate eggs that are fertalized
asymmetric cell division
a cell divides to produce 2 cells that are different from each other
transcription factors
proteins that control transcription (expression of genes) by speeding up or slowing down production of proteins
zygote
-initial cell formed when a new organism is produced by sexual reproduction
-all cells are descendants from the zygote in a human
totipotent
stem cell that is able to produce any type of cell
pluripotent
stem cell that is able to produce most all different cell types
multipotent
stemm cell that is able to produce a number of different closely related cell types
Animal vs. Plant
(Mitosis)
Animal cell-has centrioles
-cleavage furrow
Plant cell-cell plate to make new cell wall
Spermatogenesis
spermatogonium
primary spermatoctye
secondary spermatoctye
spermatids (spermatozoa)
Oogenesis
oogonia
primary oocytes
secondary ooctye+1 polar body
ovum+3 polar bodies