transgenic animals

[sandy]

how do animals become transgenic?

[Dr.Stein]

It is when their body contain genes transfered from another organism(s)

Look at here



Legend:

Illustration of how transgenic mice are produced.

Genes responsible for particular traits or disease susceptibility are chosen and extracted. Next they are injected into fertilized mouse eggs. Embryos are implanted in the uterus of a surrogate mother. The selected genes will be expressed by some of the offspring.

Since the first gene transfers into mice were successfully executed in 1980, transgenic mice have allowed researchers to observe experimentally what happens to an entire organism during the progression of a disease. Transgenic mice have become models for studying human diseases and their treatments.

[appleguo]

Does it also mean that even if the animal is transgenic, it does not necessarily produces offspring with the desired genes?

[Dr.Stein]

Naturally, we cannot choose which genes we desire in our offspring...

[aileen]

that is they contain genes which are really alien into there system.. a particular gene of desired characteristics is injected.. (try reading melcular biology books, or use google)

[baikuza]

hey.. you said mouse egg? i do not think so. it is vivipar, not ovipar

[Dr.Stein]

hey.. you said mouse egg? i do not think so. it is vivipar, not ovipar

VERY FUNNY! egg = ovum tsk...tsk...tsk

[baikuza]

ovum differ with egg. egg has strong shale, but ovum not. ovum always haploid(normally).egg can be diploid or haploid.
by the way... please do not use any confusious figure for explain some thing. that makes some one is thinking the wrong....(look at your fig. above.)
thanks

[Dr.Stein]

Excuse me, how long have you been in Biology? I do not mean to offend you but the term "egg" is common to refer to "ovum". I do not mean to be arrogant, but I have been in Embryology and Reproductive Biology and using egg or ovum doesn't mater for us in those fields.

Reptilian (oviparous) and birds egg, oviparous mammal eggs, and also most terrestrial invertebrates eggs are protected by hard shell because they will laid in external and dry environment, means that they need extra protection to become survive. Toads eggs are protected only by slime because they are kept in the water. Frogs eggs are protected by foamy structure because they are laid out of water but they need a moisture for embrios to able to survive. They are just some examples. Now you can compare with viviparous reptiles and mammals. I hope this is clear for you now.

Any questions, arguments, and other things are always welcome

P.S. I cannot see other users are confused If you are confused then ignore it, and try to find another figure for yourselves, that's quite easy

[baikuza]

okay...

i can accept this.

(^ ^)