MCQs Plant Breeding and Genetics-47 Posted on 2025-11-16Author admin 0 1. A population with low heterozygosity is likely to have __________ Reduced fitness and resilience High gene flow Low mutation rates Greater adaptive potential 2. Genetic load increases when __________ Heterosis occurs Gene flow increases Deleterious mutations are efficiently removed Mutation rate exceeds selection rate 3. _________ is the male inflorescence of maize Spadix Tassel Cob  Spikelet 4. Hybrid vigor (heterosis) results when __________ Offspring have higher fitness than parents due to heterozygosity Deleterious alleles accumulate Mutation rate decreases Homozygous alleles increase 5. Inbreeding depression is typically more severe in __________. Recently founded populations Hybrid populations Large, genetically diverse populations Small, isolated populations 6. Hybrid vigor is most often observed in the __________ generation. F3 Parental F2 F1 7. _________ is the female inflorescence of maize Tassel Spikelet Spadix Cob 8. Rhizobia are bacteria that live in the roots of leguminous plants, where they play a crucial role in _________ Water absorption Pathogen defense Nitrogen fixation Nutrient uptake 9. Genetic drift contributes to loss of heterozygosity at a rate inversely proportional to __________ Population size Selection pressure Mutation rate Gene flow 10. Which of the following pairs is correct? Grass – Panicle Mustard – Spike Corn – Raceme Wheat – Capitulum Loading …
