1) The part of the plant w the largest variation are the leaves because they come in different sizes and shapes like on any plant it could have oval leaves that are big and might have green veins.Others might have even purple stems while others just have the regular green ones. Their can also be a difference with the height of the plant as well.Some plants are small and maybe big while others are tall and small, like the brassica plant, their all different.
2) Their are many different characterisitics with the Brassica plant because of the genes and traits. The Brassica plant uses selective breeding to give their children different traits to see which have a higher chance in living and to know what changes to do in the plants genes.Now we use different plants to breed with the Brassica which is called Artificial selection. Another thing is that some plants don't even need breeding in order to make changes within itself. Sometimes the plant gets exposed with something causing a mutation yet mutations aren't always a bad thing so it could give it a advantage or a disadvantage. Though these plants will pass their genes they will also pass the mutation, which will end with more variations of the brassica plant.
3) The stems are the most consistent part of the plant. Most plants usually have around the same thickness and color with their stems. This is probably due to Decent Modification and how the past Brassica plant had these types of stems and thickness with their stems which then got passed down with their offspring. Lastly it seems that their wasn't much of a mutation to effect these genes due to how many plants now seem to look no different in their stems.
4) In my opinion breeders might have to do Artificial Breeding in order for a mutation to occur in the plant that changes the stems. It would be difficult since you have to find the right mutations that effect the stem or effect the color of it. While thats difficult Artificial Breeding won't be such as hard since your options are more minimized. You could just use a Brassica plant and pair it with some other plant with around the same genes and just see what happens. Due to this theirs a higher chance in the changes within the stem in the plant.
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