Page 609 - Ultimate Visual Dictionary (DK)

CLONING TECHNOLOGY
Zona pellucida
(protective Maternal genetic Two sets of genetic material
casing around material from come together at fertilization
egg cell) nucleus of egg to form new genome
Polar body Stem cells treated with
disintegrates chemicals to encourage
specialization

Pancreatic Myocardial Neurons
cells (heart muscle) (nerve
cells cells)
and
tissues

Sperm Fluid
cell Paternal genetic
material from
head of sperm

Egg cell begins
to divide

Stem cells
harvested

Zona Early embryo Stem cells of early
gradually at ball-like embryo, with potential Lymphocytes
breaks blastocyst stage for specialization
down (white blood cells)

Chemicals and
growth factors are
added to encourage
the egg to divide
Layer of dividing
stem cells
Genetic material
donor
ANIMAL CLONING
EMBRYONIC STEM CELLS
Cells Base layer
prepared Genetic
in tissue material
culture inserted Multiplying Birth of clone—
into egg cells of early “identical twin”
Egg cell cell embryo of genetic donor
accepts
donated
genetic
material
as its own
Cells from
genetic donor

Egg cell
donor
Egg cell Electric shock Embryo implanted in
nucleus stimulates egg womb of surrogate
removed cell division mother
Egg cell with nucleus

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