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Bio; Lecture 16; Animal Evolution

Bio; Lecture 16; Animal Evolution - system o The nucleus of...

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Principles of Biology 2 BIO U103 2/15/07 Where stem cells are acquired o Adult tissue: bone marrow, fat, etc o Fetal tissue: umibilical cord, placenta o Fertilized human embryos o Parthenogenetic eggs o Nuclear transplants (cloning) Parthenogenetic o Eggs are extracted before meiosis I. they are extracted as haploid cells. o They re stimulated with an electric shock in order to start dividing o They immediately begin to cleave, and eventually produce blastocists o This will never produce an embryo, but it does produce stem cells that are capable of regeneration. Nuclear Transplants (cloning) o Could result in tissue that will not be rejected by the patient’s immune
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Unformatted text preview: system o The nucleus of a female somatic cell is acquired o The egg (with nucleus removed) is taken from another sheep o The nucleus from sheep 1 is inserted into the egg o The egg has all the cytoplasmic determinants and yolk that are required for creation of an embryo. o The nucleus starts to cleave, and eventually it results in a blastula o The cells were harvested prior to implantation, but then were inserted into another female as a surrogate mother. o The offspring is genetically identical to the mother that donated the original sheep. - 1 -...
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