Attack of the Clones!. REVIEW. Asexual cloning occurs in nature Plants and less complex organisms can all duplicate trough asexual methods Complex, multicellular organisms have lost ability to asexually reproduce Cells have become too specialized . Human Assisted Cloning.
Attack of the Clones!
Can be used to save the DNA from endangered species or mass produce organisms with desirable traits
There are two types of cloning we’ll discuss:
Also called adult DNA cloning
Purpose: to create a genetic duplicate of an existing (or previously existing) organism with desirable traits
Because the cells are specialized, you can’t just turn a single skin cell into a new individual!
July 5, 1996 – Feb. 14, 2003
cloned from the cell of a mammary gland
Was able to reproduce
There are 5 steps in the therapeutic cloning process:
Remove nucleus from an egg cell
A mammary gland cell is removedfrom an adult female
Electricity fuses mammary and egg cell
Fused cell begins dividing
Dividing embryo is inserted intosurrogate mother
only about 10% of clones usually survive
Surviving clones can be abnormally large and experience higher rates of infection and cancer
For example, before Dolly died of a lung disease she appeared to be aging faster than other sheep.
used to correct health problems
uses human embryonic stem cellsand adult stem cells
Stem Cells: cells that have the potential to become many different types of cells
Embryonic Stem Cells: more desirable because they can become any one of our 200 types of body cells
Stem cells can be used to replace damaged cells in patients with diabetes, spinal cord injuries, and Parkinson’s disease.
Embryonic stem cells are often used
Adult stem cells are not as adaptable
from embryos which are destroyed when