Plant Breeding Overview (HS 521)

Exercise 4 – Polyploids, Interspecific Hybridization, Mutation Breeding

Give complete answers, but be brief and specific. Show your work.

20 points total

1. A simplex autotetraploid (Aaaa) was self-pollinated. What is the phenotypic ratio of its progeny? Assume random chromosome assortment.



2. With regard to alien addition lines:
2a. How are the lines developed by plant breeders?



2b. How are the lines used in crop improvement programs?



3. What are three uses and three potential problems of mutation breeding in a breeding program?