Mendalian genetics - (Feb/16/2008 )
Does Mendelian Genetics work in hybrids according to me it shud not as the first criteria for its working is that the plant shud be true breeding if this is so how is resistance transferred in to the further generation and how shud it be tracked
Firstly, yes Mendelian genetics should work in hybrids (assuming they are stable hybrids), because it's still a matter of which allele is dominant. Tracking is the same as for pure bred strains.
Secondly, would you mind using the keys at the bottom right-hand corner of the keyboard (you know, the comma, period and question mark)??? Punctuation is a pretty straightforward thing to add, and it makes language meaningful. Please do it out of respect for us, if not yourself.
Yes, these hybrids are stable. I have cross pollinated a resistant hybrid to a susceptible hybrid towards a disease. The progeny will be a heterozygote. Cud you explain me the menedilian genetics ratio of the F2 generation?
nd thanks for remindng of my punctutation I was in a little hurry that day
nd thanks for remindng of my punctutation I was in a little hurry that day
Disclaimer No1: I am not a plant biologist. Disclaimer No2: I am not a geneticist.
If you call the resistance gene R, the susceptible hybrid should be rr, and the resistant one either Rr or RR (but I'm guessing it will be RR, as the trait is stable). Either way, it should be fairly straightforward to do the cross on paper and see what ratios you should expect to get. If it's Rr, you should get 50% susceptible, and 50% resistant (but all heterozygotes). If the resistant plant it RR, then everything will be resistant (and heterozygotes). The next generation should be the final clue.
just as swanny said.
V
that is if the gene of your interest follows mendelian rules. when you generate hybrids from inbred lines you get a phenomena called "heterosis" which should increase the strenghts of the F1 and include the resistance you are talking about. i think the easiest way to track if your organism is resistant is to make confrontations to the pathogen.