Free Plant Breeding and Genetics MCQs with Answers

• A. Hybrid
• B. Homozygous
• C. Heterozygous
• D. Dominant

Explanation: An individual carrying two identical alleles for a gene is homozygous, such as BB or bb.

• A. 10
• B. 20
• C. 40
• D. 15

Explanation: Each chromosome pair represents one linkage group, so the number of linkage groups generally equals the haploid chromosome number.

• A. Chromosomal mutation
• B. Gene mutation
• C. Monoploldy
• D. Synapsis

Explanation: A chromosomal mutation involves structural changes such as transfer, deletion, duplication or inversion of chromosome segments containing…

• A. Gene map
• B. Ideogram
• C. Karyotype
• D. Phenotype

Explanation: An idiogram is a diagram showing chromosomes arranged according to their relative size and other features.

• A. 0/1
• B. Half
• C. 1/1
• D. 1/4

Explanation: If the plant produces only BM and bm gametes in equal proportions, the bm gamete has a one-half chance of meeting a BM gamete and a…

• A. Any two chromosomes with one each
• B. Two non homologous chromosomes
• C. Two homologous chromosomes
• D. Same chromosomesHire Grant Writers

Explanation: Alleles occupy the same locus on a pair of homologous chromosomes, with one allele inherited from each parent.

• A. All the above
• B. Overdominance
• C. Epistasis
• D. Dominance

Explanation: Heterosis can arise through dominance, overdominance, and favorable epistatic interactions among genes.

• A. Nelson (1973)
• B. Flor (1956)
• C. Robinson (1971)
• D. Vander plank (1963)

Explanation: The gene-for-gene hypothesis was proposed by H. H. Flor in 1956 while studying flax and flax rust resistance.

• A. Cenified seed
• B. Foundation
• C. Nucleus seed
• D. Registered seed

Explanation: Breeder seed is produced by the breeder from nucleus seed, which is the genetically purest and most carefully maintained seed class.

• A. Stout (1917)
• B. Gerstel (1900)
• C. Brewbaker (1810)
• D. Koelreuter (1763)

Explanation: Joseph Gottlieb Kölreuter reported male sterility in flowering plants in 1763.

• A. Plasmalema
• B. Plasmedesmata
• C. Trachieds
• D. Nessels

Explanation: Plasmodesmata are microscopic cytoplasmic channels crossing plant cell walls and allowing neighboring cells to exchange substances and…

• A. Watson and Crick (1953)
• B. Crick (1966)
• C. Jacob and monod (1965)
• D. Briuen and Davidson (1959)Search Public Records

Explanation: François Jacob and Jacques Monod discovered the operon model of gene regulation and received the 1965 Nobel Prize in Physiology or…

• A. Crossing over
• B. Segregation
• C. Hybridization
• D. Non-disjunction

Explanation: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly, producing a gamete with an extra…

• A. Balbiani (1881)
• B. Mendel (1810)
• C. Allard (1910)
• D. Baranetzky (1910)

Explanation: Polytene chromosomes were first described by Édouard-Gérard Balbiani in 1881 from the salivary glands of dipteran larvae.

• A. Heptose
• B. Hexose
• C. Pentose
• D. Triose

Explanation: DNA contains deoxyribose, a five-carbon sugar, so it is classified as a pentose.

• A. Solution
• B. Semi-solid
• C. Colloidal solution
• D. Crysto colloidal solution

Explanation: Protoplasm is a complex colloidal system containing water, dissolved crystalloids and suspended colloids, so it is described as a…

• A. Chromosome movementOrder DNA Kits
• B. Nucleolus formation
• C. Chromosome replication
• D. Spindle formation

Explanation: The centromere forms the chromosome region where spindle fibres attach through the kinetochore, allowing chromosomes to move during cell…

• A. metaphase I
• B. Auaphase I
• C. Metaphase II
• D. Anaphase II

Explanation: Homologous chromosome pairs separate during anaphase I of meiosis, while sister chromatids remain joined.

• A. Two
• B. Eight
• C. Six
• D. Four

Explanation: RNA contains four nitrogenous bases: adenine, guanine, cytosine and uracil. Uracil replaces the thymine found in DNA.

• A. 5 carbon sugars
• B. 4 carbon sugars
• C. 3 carbon sugars
• D. 6 carbon sugars

Explanation: RNA contains ribose, a five-carbon pentose sugar. DNA also contains a five-carbon sugar, but it is deoxyribose rather than ribose.