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Originally Posted by BigVanVader
For example, how do you know what traits are recessive vs dominate? Also is there a good book that would be helpful?
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The list someone already posted is good, but can be overwhelming as there are a tremendous number of 'genes' found, but most of them are minor or useless except for scientific study. Also note that a number of genes and there 'allelles' recessive forms used to be noted by capitalization for the dominate genes and lower case for the recessive and early genes were named for the their dominate type (like R for Red-flesh). I've notice that in some cases the way things are noted have changed. Now genes are usually named for the recessive form and the dominate form of the gene is noted with a plus symbol (+). So the gene that controls determinate growth versus indeterminate is labeled as sp (for self-pruning) and the dominate form of the gene (which is the indeterminate form) is sp+.
Two good books to start with:
"Breed Your Own Vegetable Varieties: The Gardener's and Farmer's Guide to Plant Breeding and Seed Saving", 2nd edition by Carol Deppe (although I liked the 1st edition better)
"Plant Breeding for the Home Gardener: How to Create Unique Vegetables and Flowers" by Joseph Tychonievich
Neither is solely about tomatoes.
Chris