mutation

I have been watching my small garden all summer , and yesterday I noticed that one of the tomatoes had a pale yellow colour instead of the usual red . At first I thought it was a problem with water or soil , but later I read that a mutation can sometimes change a plant's colour . If I were to save seeds from that tomato , they would probably produce similar plants , although nothing is certain . This idea is interesting because it shows how small changes in nature can create new varieties that look different but are still safe to eat . I am planning to keep a close eye on the plants and to compare the next harvest with the earlier ones .