Search found 160 matches

by Jelanen
Fri Mar 04, 2005 1:43 am
Forum: Human Biology
Topic: IMMUNITY
Replies: 6
Views: 8453

All activation of adaptive immune response (T-cells and B-cells mainly) is antigen specific. What happens with T-cells is the naive(unactivated) T-cell (CD4--CD8 T-cell will become cytotoxic T-cells if activated) bounces around lymph nodes, constant coming in contact with professional antigen presen...
by Jelanen
Fri Mar 04, 2005 1:28 am
Forum: Botany Discussion
Topic: nondisjunction in plants
Replies: 4
Views: 9050

Plants are the genetic whackos of the biology world. If memory serves, wheat was recently the first plant genome sequenced and wheat is usually 4n. I'm no plant geneticist but I do know that plants play a different ball game when it comes ploidy. Heck, there are even organisms that are 1n and some t...
by Jelanen
Fri Mar 04, 2005 1:24 am
Forum: General Discussion
Topic: Defenitions for biology terms
Replies: 2
Views: 8210

Couple clarifications. Ploidy varies by species. Humans are 2n (meaning we have 2 of each autosome) some things are 1n. Plants get really crazy...some are 4n or more. The interactions between proteins and DNA can be very complex and nomenclature can make the difference between confusion and understa...
by Jelanen
Fri Mar 04, 2005 1:11 am
Forum: Genetics
Topic: Epistasis vs. Polygenic Inheritance
Replies: 3
Views: 17715

Epistatis is a form of gene interaction in which one gene masks the phenotypic expression of another. Polygeneic inheritance is when multiple genes are involved in the phenotypic expression of a single trait. Its not really an either or thing, I'm sure (though I can't think of one off the top of my ...