Plsc203- study guide test 2

Plsc203- study guide test 2 - Geneticerosion=/variability....

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Genetic erosion= loss of crop biodiversity/variability. Affects all plant germplasm. Germplasm= all genetic resources that can be used to improve crop plants.  1) Wild relatives (highest domestication/gene variation)- high diversity 2) Land races- type of variety that farmers in developing countries grow. The first plants that  were domesticated. Not uniform.  3) Old varieties 4) Current varieties (lowest domestication/gene variation)- less diversity Irish potato famine- Only 2-3 varieties of potato were being grown and they got a disease  called leaf blight. 1845. Potato originally comes from Peru/Bolivia. Killed about 1 million  and 1 million emigrated. At the time, the Irish were growing potatoes for the British  because they were under the Britain governments control. “Cloning” produces the exact  same genetics and therefore the infected potatoes/plant pathogens spread quickly.  In-situ conservation- actually growing the real plants. Maintained land races and wild  relatives on the farm. In mexico, maize and beans are grown close to their wild relatives.  Advantages are that they preserve the habitat and generate new variation by crossing.  Disadvantages include that they’re not practical b/c of loss of habitat Ex-situ- gene “banks”. Many seeds in a small place and insurance for future generations 
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '08
  • JoseCosta
  • wild relatives, plant. Ex.  Wheat, plants.  Wild relatives, tubers. Ex. Potatoes, Genetic erosion= loss

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern