breeding Question about isolating a new cross

[Brendon Douglah]

Hey everyone, I have a question regarding a new cross that I have received from a FB friend of mine. Very excited about this one.
 
He has grown out the F1 generation and provided me with the seeds. I am planning on growing 4 plants of this cross in my grow tent for the F2 generation. Do I need to have isolation netting between each plant or can I have them together and risk cross-pollination... even though the seeds are genetically the same? Or can I just grow the plants in the same space together as cross pollination wouldn't matter in this situation? I don't understand genetics very well at all.
 
Any help on this is very appreciated. Thank you all.
 

 

[CaneDog]

It's best to isolate each plant, especially if you're selecting for recessive pairings, but if you're indoors in a tent it's close to a non-issue.  Most likely you have no pollinator activity and netting won't stop pollination by air drift, which would be likely be negligible anyway.  What I do is stop running my fan during flowering until I have isolated pods set and then I mark them, just to be safe. It they're not setting well, I remove the plants and manually pollinate being sure not to use the same implement, brush or whatever, on successive plants. 

 

[Max Nihil]

The plants aren't actually genetically the same unless they are cuttings from the same plant.

Even when a variety is stable and (what is termed) homozygous the seeds it produces (by itself) are still genetically different and will produce plants with slight variations despite breeding true.

When a plant is not homozygous or stable the variation is much greater even when the seeds are from the same fruit.

CaneDog's advice is spot on.