Free Plant Breeding and Genetics MCQs with Answers
329 Plant Breeding and Genetics MCQs from Agriculture, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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329 questions · page 6 of 17
- A. Plasmalemma
- B. Ribosomes
- C. Nuclcolus
- D. Chromosome
Explanation: The plasmalemma, or plasma membrane, is made mainly of lipids and proteins and does not contain RNA as a structural or genetic component.
Correct answer: Plasmalemma- A. Rice
- B. Cabbage
- C. Maize
- D. Tomato
Explanation: Self-incompatibility prevents self-fertilization and forces pollen from another plant, making it useful for hybrid seed production in…
Correct answer: Cabbage- A. Mendel lan monohybrid
- B. Mendelian dihybrid
- C. None of the above
- D. Incomplete dominance
Explanation: With incomplete dominance, the three genotypes produce three visibly different phenotypes, so both genotype and phenotype ratios are…
Correct answer: Incomplete dominance- A. Crossingover
- B. Polyploidy
- C. Mutations
- D. Linkage
Explanation: Crossing over creates new combinations of genes and therefore contributes to variation among offspring.
Correct answer: Crossingover- A. Dominance
- B. Liukage
- C. Independent assortment
- D. Purity of gametes
Explanation: Linkage is an exception to Mendel’s law of independent assortment because genes located close together on the same chromosome tend to be…
Correct answer: Liukage- A. Genetics
- B. Mutation
- C. Evolution
- D. Polyploidy
Explanation: Evolution is the gradual change in populations through successive generations, driven partly by genetic variation and selection.
Correct answer: Evolution- A. 1:1:1:1
- B. 1:2:3
- C. 3:1
- D. 1:2:1
Explanation: The all-tall, all-red F1 indicates that tall and red are dominant and that the F1 is heterozygous for both traits.
Correct answer: 1:1:1:1- A. 6
- B. 12
- C. 24
- D. 36
Explanation: In gymnosperms, the endosperm is a haploid female gametophyte rather than the triploid tissue found in angiosperms.
Correct answer: 12- A. Dominance
- B. Independent assortment
- C. Segregation
- D. Incomplete dominance
Explanation: Selfing a heterozygous tall plant (Tt × Tt) separates the two alleles and produces tt dwarf offspring along with tall plants.
Correct answer: Segregation- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: The cross Tt × tt produces Tt, Tt, tt and tt in the expected ratio, so half the progeny are homozygous dwarf.
Correct answer: 50%- A. Segregation, independent assortment and dominance recessive ness
- B. Gene linkage, dominance and segregation
- C. Segregation, independent assortment and gene linkage
- D. Gene linkage, character se gregation and independent assortment
Explanation: Mendel’s three principles are dominance, segregation and independent assortment.
Correct answer: Segregation, independent assortment and dominance recessive ness- A. Gametes will have 8 chromosomes
- B. Zygote will have 4 chromosomes
- C. Gametes will have 4 chromosomes
- D. Zygote will have 16 chromosomes
Explanation: Leaf cells are normally diploid somatic cells, so their chromosome number is 2n = 8.
Correct answer: Gametes will have 4 chromosomes- A. Monoploid
- B. Diploid
- C. Tetraploid
- D. Triploid
Explanation: Commercial seedless watermelons are usually triploid, produced by crossing tetraploid plants with diploid plants.
Correct answer: Triploid- A. Self pollinated crops
- B. Cross pollinated crops
- C. Vegetative propagated crops
- D. Often cross pollinated crops
Explanation: Mutation breeding is especially useful in self-pollinated crops because a useful mutation can be fixed and maintained through subsequent…
Correct answer: Self pollinated crops- A. Mitosis
- B. Meiosis
- C. Amitosis
- D. all the above
Explanation: Synapsis is the pairing of homologous chromosomes during prophase I of meiosis. It does not occur in ordinary mitosis or amitosis.
Correct answer: Meiosis- A. Hardy (1908)
- B. Ford (1940)
- C. Muller (1950)
- D. Satisbury (1940)
Explanation: J. B. S. Haldane introduced the idea of genetic load, but the term is commonly credited in such MCQs to H. J. Muller in 1950.
Correct answer: Muller (1950)- A. Heterostyle
- B. Dichotamy
- C. Dichogamy
- D. Heterospory
Explanation: Dichogamy is the condition in which anthers and stigmas mature at different times in the same flower, reducing self-pollination.
Correct answer: Dichogamy- A. 100 meters
- B. 50 meters
- C. 200 meters
- D. 3 meters
Explanation: Bhindi is cross-pollinated by insects, so seed crops require substantial isolation to prevent unwanted pollen contamination.
Correct answer: 200 meters- A. Switzerland
- B. USA
- C. Den nark
- D. Thailand
Explanation: UPOV, the Union for the Protection of New Varieties of Plants, has its headquarters in Geneva, Switzerland.
Correct answer: Switzerland- A. Wheat
- B. Sorghum
- C. Rice
- D. Maize
Explanation: Dee-Geo-Woo-Gen is a dwarfing donor in rice breeding and contributed genes used in semidwarf rice varieties.
Correct answer: Rice