Free Plant Breeding and Genetics MCQs with Answers

• A. Backcross
• B. Test cross
• C. Hybridization
• D. Trihybrid

Explanation: A hybrid crossed with its recessive parent is specifically a test cross, because the recessive parent reveals the hybrid’s hidden alleles.

• A. Photocopy
• B. Prototype
• C. Apheliotropic
• D. Phenotype

Explanation: Phenotype means the observable appearance or traits of an organism, produced by its genotype interacting with the environment.

• A. Hybrid
• B. Heterosis
• C. Backcross
• D. None of the aboveAccess Government Careers

Explanation: The offspring produced by crossing genetically unlike parents is called a hybrid.

• A. All dominant genes will segregate together into daughter cells
• B. All homologous chromosome pairs will separate
• C. All daughter cells will have different homologous chromosome pairs
• D. All linkage group will be disruptedGet Language Courses

Explanation: During normal meiosis, homologous chromosomes separate at anaphase I, so every homologous pair is distributed between the daughter cells.

• A. Allopolyploidy
• B. Amphidiploids
• C. Autopolyploid
• D. Annapolis

Explanation: Autopolyploids have multiple chromosome sets originating from the same species.

• A. A mutant organism which has lost its ability to synthesize one or more essential nutrients
• B. A plan that is able to synthesize its own carbohydrates
• C. An organism that depends on other organism for meting its nutrient requirements
• D. non of theseOrder DNA Kits

Explanation: An auxotroph is a mutant that cannot synthesize one or more nutrients required for its growth and must obtain them from the medium or…

• A. AB, ab
• B. AB, Ab, aB, ab
• C. Ab, ab
• D. Data insufficient

Explanation: For AaBb with independent assortment, each gamete receives one allele from each gene pair, producing AB, Ab, aB, and ab.

• A. Law of limiting factors
• B. Law of segregation
• C. Law of dominance
• D. Law of inheritanceGet Language Courses

Explanation: When one allele expresses its trait and masks the expression of its contrasting allele in a heterozygote, the principle is Mendel’s law of…

• A. Halving of chromosome nuriber between two daughter cells
• B. Crossing over of the genes
• C. Formation of two daughter cells with identical DNA
• D. Segregation of maternal and paternal charactersAccess Government Careers

Explanation: Mitosis preserves genetic continuity by copying DNA and distributing an identical chromosome set into each of two daughter cells.

• A. Hybrid
• B. Mutant
• C. Variant
• D. Polyploidy

Explanation: A hybrid is the offspring produced by crossing two genetically different individuals, often differing in one or more traits.

• A. Presence of multiple alleles
• B. Linkage and crossing over
• C. Presence of lethal genes
• D. Sex-linkage

Explanation: The two parental combinations are far more frequent than the two new combinations, showing linkage with occasional crossing over.

• A. Autodiploid
• B. Hexaploid
• C. Amphidiploid
• D. Autopolyploid

Explanation: Doubling the chromosomes of an F1 hybrid restores pairing between chromosomes from the two parent species and produces an amphidiploid…

• A. Bagging
• B. Inter over crossing
• C. Intraspecific crossing
• D. Inosculation

Explanation: Bagging and crossing are used to control or perform hybridization, including crosses within a species.

• A. The gene pool is maintained
• B. Improvement of crop can take place
• C. Microbes act as biological factories
• D. Genetic error can be rectifiedOrder DNA Kits

Explanation: Genetic engineering can use microbes as production systems, improve crops and correct or introduce specific genetic traits.

• A. Diploid number of chromosomes
• B. Tetraploid number of chromosomes
• C. Haploid number of chromosomes
• D. None of the above

Explanation: The number of linkage groups normally corresponds to the haploid chromosome number because each group represents chromosomes linked…

• A. Albinism is dominant over green characters
• B. Green plastids of male parent become nitrated
• C. Crossing over results in structural changes in green plastids
• D. Plastids are inherited through maternal parents

Explanation: Maize plastids are transmitted mainly through the female parent, so the albino female determines the plastid phenotype of the progeny.

• A. Lysendo
• B. Vavilow
• C. Weismann
• D. H be vnes

Explanation: Trofim Lysenko promoted ideas resembling Lamarckian inheritance, particularly the influence of environment and acquired characteristics.

• A. Mendel
• B. Huge and Vnes
• C. Darwin
• D. Lamak

Explanation: Hugo de Vries proposed the mutation theory, which explained evolution through large, sudden and discontinuous variations.

• A. None of the above
• B. There are more plants than animals
• C. Plants are similar in structure
• D. Plants can manufacture their own food material

Explanation: The question reflects the older textbook view that early plant-like organisms were regarded as autotrophic because plants can manufacture…

• A. Breeding with the wild variety
• B. Heat treatment
• C. Colchicines treatment
• D. Hormone spray

Explanation: Breeding cultivated plants with resistant wild relatives can introduce genes for disease resistance, after which selection fixes the…