The process by which cells become specialized is known as ___________________. During the
development of an organism, ___________________________________________________________.
The process of differentiation determines a _____________________________, or how it will spend its
life.
Zygote – a single ______________________ egg
The zygote is totipotent - _______________________________________________________
Human development –
Egg plus sperm – embryo grows into a ___________________which is a hollow ball of cells with a cluster
of cells inside known as the inner mass. The outer cells will form tissues that attach to the mother,
while the inner cells will become the embryo itself. The inner cells are ________________________
which can develop into any of the body’s cell types – but cannot form the tissues surrounding the
embryo.
STEM CELLS are ________________ cells from which ____________________ cells develop.
Found in the embryo and in the adult body.
You have pools of adult ________ _________located throughout the body: bone marrow, fair follicle,
brain, heart, and spinal cord. These adult cells are referred to as ______________________ stem cells,
because the types of differentiated cells they can form are usually limited to replacing cells in the tissues
where they are found.
Embryonic stem cells ___________________ embryonic stem cells are more versatile than adult stem
cells – b/c they can produce every type of cell in the body.
Frontiers in stem cells research –
Scientists are working to use adult stem cells to use treat certain conditions like heart attack- harvest
adult stem cells from bone marrow and injected into damaged area = the cells should learn what type of
cell they need to be by the surviving cells around him.
Human embryonic stem cell research is controversial because the arguments for it and against it both
involve ______________________ issues of ___________ and ______________.