BIOB38H3 Lecture Notes - Lecture 3: Einkorn Wheat, Seed Dormancy, Durum
Document Summary
Genetically speaking, fishing in the dark: method that provided us with the majority of heirloom crops before 1940. Male flowers (tassels), female ears with long stigma silks: step 1: pick potentially useful parents many possible useful traits, can"t be good for all traits. Trade-off between the target characteristic and the rest: bummer parents are heterozygous, only 25% good seeds. With big ears and starch: want to create homozygous plants. Mutation breeding: use physical/chemical mutagens to enforce mutations. Need dominant or double-recessive, and most are recessive: unpredictability of mutations, only mutation in shoot apical meristem is desirable (want in pollen or egg, recessive won"t phenotypically see it, navel oranges mutation to sterilize through mutagenesis. Is happier to live inside a plant: has bacterial dna and plasmid dna containing tumor-inducing genes, enter stem or root through wound. Multiply and spread in tissue: injects plasmid dna into the plant dna.
