Cytoplasmic-genetic male sterility was first unmasked by___________________?
Show answer Hide answer
Answer: A. Jones and Davies (1944)
Explanation
Jones and Davis published the first comprehensive report on cytoplasmic-genetic male sterility in maize. Their research uncovered how nuclear genes interact with cytoplasmic factors to control pollen sterility. Historical plant breeding literature credits Jones and Davis for this milestone discovery in 1944. Cytoplasmic-genetic male sterility requires both specific cytoplasm and nuclear restorer genes. Maize breeding programs revolutionized hybrid seed production following the discovery of this sterility system. Understanding dual genetic control helped scientists prevent crop vulnerability to specific fungal blights.
Hybrid corn production relied heavily on sterile cytoplasm sources to eliminate manual detasseling labor. Plant pathologists study sterility systems to ensure that commercial hybrids maintain disease resistance. Geneticists continue to explore organellar interactions to improve modern hybrid breeding technologies. DeVries and Correns rediscovered Mendel's laws independently at the turn of the twentieth century. Bruce and Keeble investigated maize heterosis and inbreeding depression early in the 1900s. Nilson contributed to botanical genetics, but did not discover cytoplasmic-genetic male sterility in 1944.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
Related questions
Q1. The drying capacity characteristic of an oil relies upon _________?
Show answer Hide answer
Answer: A. Iodine %
The drying capacity of plant oils depends directly on their degree of fatty acid unsaturation. Iodine percentage measures this unsaturation level, determining how quickly the oil hardens. High iodine values indicate nume...
Q2. ICARDA has its headquarters stationed at___________________?
Show answer Hide answer
Answer: C. Syria
ICARDA maintains its primary international headquarters stationed within the borders of Syria. The research center operates experimental stations across dry areas from its base location. Administrative operations and cen...
Q3. The variance between the mean phenotypic score of selected progeny and the parental base is designated as__________________?
Show answer Hide answer
Answer: B. Genetic advance
Genetic advance measures the expected improvement in population mean performance after selection. It represents the difference between the mean phenotypic score of selected progeny and the parental base. Breeders calcula...
Q4. Line-by-tester mating designs execute crosses connecting:
Show answer Hide answer
Answer: A. Males & females
The line by tester mating design requires crossing female lines with male testers. This specific method connects male parents and female parents to evaluate combining ability. Researchers use this controlled crossing sch...
Q5. The international potato gene repository is located at_____________________?
Show answer Hide answer
Answer: C. CIP Peru
The International Potato Center holds the world potato collection and is based in Peru. Peru is recognized globally as the center of origin and diversity for potatoes. The institution known as CIP operates directly from...
Q6. Germplasm designated for brief preservation spans (3 to 5 years) is classified as___________________?
Show answer Hide answer
Answer: B. Working collection
Working collections are specifically maintained for short term breeding and research objectives. These active accessions are frequently evaluated and replenished over short time spans. Storage durations typically range f...