All Free Agriculture MCQs with Answers

• A. TTxTT
• B. Ttxtt
• C. TtxTt
• D. TTxTt

Explanation: A test cross mates an individual showing the dominant trait with a homozygous recessive, such as Tt × tt.

• A. Are useful in studies on meiosis
• B. Grow better under adverse conditions
• C. Give homozygous lines following diplodization
• D. Require only about half the amount of chemical fertilizers compared to diploids

Explanation: Haploids contain one chromosome set, so chromosome doubling produces completely homozygous diploid lines in a single generation.

• A. All the heterozygous tall
• B. All homozygous dwarf
• C. 2 tall: 2 dwarf
• D. One homozygous tall, one homozygous dwarf, two heterozygous tall

Explanation: Crossing homozygous tall TT with homozygous dwarf tt gives only Tt offspring. Since T is dominant, all offspring are heterozygous tall.

• A. Wheat & rice
• B. Rye & Wheat
• C. Wheat & Anglos
• D. Rice & maize

Explanation: Triticale is the crop created by combining wheat and rye through intergeneric hybridization, followed by chromosome doubling to restore…

• A. Pod color
• B. Pod shape
• C. Plant height
• D. Leaf shapeSearch Public Records

Explanation: Mendel's seven pea traits included pod colour, pod shape and plant height, but not leaf shape.

• A. 48
• B. 41
• C. 44
• D. 46

Explanation: Humans normally have 46 chromosomes in somatic cells, arranged in 23 pairs. Gametes contain the reduced number of 23 chromosomes.

• A. 1:1:1:1
• B. 9:3:3:1
• C. 3:1
• D. 27:9:9:3:3:3:1

Explanation: A typical Mendelian dihybrid cross involving two independently assorting genes gives the F2 phenotypic ratio 9:3:3:1.

• A. Chromatids become chromosomes
• B. Nuclear division come to close
• C. Exchange of chromosomal materialOrder DNA Kits
• D. Chromosomes become half in number

Explanation: Crossing over exchanges corresponding segments of DNA between non-sister chromatids of homologous chromosomes during prophase I of…

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

Explanation: A backcross is made by crossing a hybrid with either of its parents to recover or study parental traits.

• A. Phenotype
• B. Genotype
• C. Allele
• D. Genome

Explanation: Genotype means the genetic constitution of an organism, whereas phenotype means its observable characteristics.

• A. Mecrosome
• B. Disome
• C. Episome
• D. Peroxisome

Explanation: An episome is a genetic element that can occur either independently in the cytoplasm or integrated into a chromosome.

• A. Affects more than five characters
• B. Affects more than ten characters
• C. Affects only one character
• D. Affects more than one character

Explanation: The term is generally written pleiotropic gene, meaning one gene influences more than one character.

• A. The failure of homologous chromosomes to separate during meiosis
• B. The crossing over between non homologous chromosomes
• C. Occurrence of karyokinesis
• D. Occurrence of crossing over

Explanation: Failure of chromosome separation can produce unreduced gametes, and their fusion may create polyploid plants.

• A. 1:2
• B. 1:1
• C. 2:1
• D. 3:1

Explanation: The cross TT × tt produces all Tt tall plants in F1; selfing them gives F2 genotypes TT:Tt:tt = 1:2:1. Thus pure tall TT to dwarf tt is 1:1.

• A. Confers
• B. Mosses
• C. grasses
• D. Gymnosperm

Explanation: Grasses are flowering plants and represent a relatively recent evolutionary group compared with mosses and gymnosperms.

• A. Cross breeding
• B. Inbreeding
• C. Self fertilization
• D. Back crossing

Explanation: A test cross determines an unknown genotype by crossing the individual with a homozygous recessive; this is a special type of backcross.

• A. Single gene may produce multiple effects
• B. The environment effects the expression of genetic character
• C. Dominance may be incomplete
• D. Genetic trails are influence by many genes

Explanation: Identical twins have essentially the same genotype, so differences between them show that environmental conditions can alter the…

• A. 12
• B. 24
• C. 22
• D. 23

Explanation: With a haploid number of 12, the diploid number is 24; a monosomic has one chromosome fewer, so its number is 2n − 1 = 23.

• A. Dominant lethal genes in heterozygous individuals
• B. Dominant lethal genes in homozygous individuals
• C. Dominant epistasis
• D. None of the above

Explanation: A 2:1 surviving phenotypic ratio results when the homozygous dominant genotype is lethal: the usual 3:1 ratio loses one lethal class.

• A. Incomplete dominant
• B. Recessive
• C. Mutant
• D. Dominant

Explanation: When the heterozygote Rw is pink rather than red, neither allele completely masks the other, which is incomplete dominance.