pesticide gene (poision bugs that will kill plant)
What is the survival resistance example?
B+ cotton gene, lethal to cotton bullworm, which eats cotton, China Okayed the B+, cotton bullworms start to die off, BUT the bullworms will eventually resistant
When a species becomes resistant to a gmo, what is that called?
Proliferation of resistant species
What are the three types of disadvantages of gmo/caveats?
What are the ecological disadvantages of gmo?
Takeover of gmo, less natural things in the ecosystem
What are the allergenic disadvantages of gmo?
gmo (pesticide) can kill bystanding plants and things
What are the practical disadvantages of gmo?
nontargeted gene cause problems (go in multiple copies/no control on gene location)
gene therapy in humans (cancer)
What is a mouse model for human disease?
A mouse model is a strain of mice that carries a mutation in a mouse gene that is analogous to a mutation in a human gene that causes disease.
With regard to maternal effect genes, is the phenotype of sucha cloned animal determined by the animal that donated the enucleated egg or by the animal that donated the somatic cell nucleus?
With regard to maternal effect genes, the phenotype would depend on the animal that donated the egg.
It is the cytoplasm of the egg that accumulates the gene products of maternal effect genes.
Does the cloned animal inherit extranuclear traits from the animal that donated the egg or from the animal that donated the somatic cell?
The extranuclear traits depend on the mitochondrial genome. Mitochondria are found in the egg and in the somatic cell. So, theoretically, both cells could contribute extranuclear traits.
In what ways would you expect this cloned animal to be similar to or different from the animal that donated the somatic cell? Is it accurate to call such an animal a “clone” of the animal that donated the nucleus?
The cloned animal would be genetically identical to the animal that donated the nucleus with regard to traits that are determinedby nuclear genes, which are expressed during the lifetime of the organism.
The cloned animal would/could differ from the animal that donated the nucleus with regard to traits that are determined by maternal effect genes and mitochondrial genes.
It is not a true clone
Reproductive cloning refers to
methods that produce two or more genetically identical individuals.
_______cloning happens occasionally in nature
Plants can be cloned from _________cells
What is the protocol for the succesful cloning of sheep?
1)Donor sheep mammary cell is extracted and grown in a tissue culture flask, another sheep's unfertilized egg is etracted (nucleus is removed)
2) The cells are fused together w/ electrical pulses
3) the donor nucleus and the maternal proteins within the enucleated egg intiate development of the egg into an embryo
4) embryo is transferred into a surrogate ewe
5) Allow preganancy to proceed
6) A lamb genetically identical to the donor sheep is born
Dolly was "genetically older" because?
Her donor genes were "older" than what she was
Stem cells supply...
the cells that construct our bodies from a fertilized egg.
In adults, stem cell replenish...
worn out or damaged cells.
What are the two common characteristics of stem cells?
They have the capacity to divide
they can differentiate into one or more speciallized cell types.
A stem cell goes through differntiation to produce what'?
a red blood cell
A fertilized egg is considered totipotent because?
it can give rise to all the cell types in the adult organism
What contains embryonic stem cells (ES cells)?
The early mammalian embryo
where are ES cells found?
inner cell mass of the blastocyst
ES cells are pluripotenet, which means..
they can differentiate itno almost every cell type of the body
During the early fetal stage of development, the germ-line cells found in the gonads are pluripotent and called
EG (embryonic germ ) cells
A multipotent stem cell can differentiate into...
several cell types but far fewer than an ES cell.
Unipotant stem cells can differentiate into...
only a single cell type (primordial germ -> sperm)