plant breeding and genetics Mcqs
151. Gynandromorphy in Drosophila because of_________________?
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A. Kappa particles

B. inheritance

C. Gain of Y-chromosome

D. Loss of X-chromosome

152. Seed germination in typhoin walermelon can successfully be obtained by____________________?
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A. Seed cot removal

B. Seed risking

C. All the above

D. Scarification
153. Mutation breeding is mostly used in____________________?
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A. Self pollinated crops

B. Often cross pollinated crops

C. Cross pollinated crops

D. Vegetative propagated crops

154. In case of incomplete dominance in the f2 generation_______________________?
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A. Ratio of phenotypes is 3:1

B. None of the above

C. Phenotypic ratio corresponds to the genotypic ratio

D. Ratio of genotypes is 3:1

158. RNA contains_____________________?
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A. 4 carbon sugars

B. 6 carbon sugars

C. 5 carbon sugars

D. 3 carbon sugars

160. The protein synthesizing system is associated with_____________________?
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A. Microtubules

B. Episodes

C. Mitochondria

D. Ribosomes
161. Which feature is not found in all living beings____________________?
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A. Protein synthesis in ribosomes

B. Some triplet code for amino acids

C. Energy storage in high high energy phosphate bonds

D. Types of protein occurring in the body

164. Mendel was lucky to use pea plants for genetical experiments because__________________?
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A. The seven characters he studied were on different chromosomes

B. They have round seeds with lot of proteins

C. They showed one type of flowers

D. they belong to the family leguminous

165. Evolution proceed on account of____________________?
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A. Adaptations through genervation

B. Conversion pf organism to change of environment

C. Struggle for existence

D. Fossils

166. A dihybrid ratio is____________________?
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A. 3:01

B. 1:1:1:1

C. 9:3:3:1

D. 27:9:9:3:3:3:1

167. The diameter of mitochondria is __________________?
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A. 40-70 micron

B. 1-4 micron

C. 0.5-2 micron

D. 2-4 micron

172. Three important law of heredity proposed by Mendel relate to___________________?
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A. Gene linkage, character se gregation and independent assortment

B. Segregation, independent assortment and gene linkage

C. Segregation, independent assortment and dominance recessive ness

D. Gene linkage, dominance and segregation

176. Ieucaena lencocephala is a popular tree for______________________?
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A. Nutritive forage

B. Seasonal fruit

C. Medicinal plant

D. Beautification

177. Where would you look for active cell division in a plant _____________________?
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A. Cortex cells

B. Pith cells

C. Tips of stem & roots

D. Internodes regions

178. Gene for gene hypothesis was proposed by__________________?
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A. Flor (1956)

B. Vander plank (1963)

C. Nelson (1973)

D. Robinson (1971)

179. Plants can be made disease resistant by___________________?
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A. Colchicines treatment

B. Breeding with the wild variety

C. Hormone spray

D. Heat treatment

183. Strands of DNA are bounded by___________________?
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A. Icygen

B. Carbon

C. Hybrogen

D. Nitrogen

184. Who discovered mitochondria__________________?
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A. Altmann

B. Palade

C. Cowdry

D. Garner

185. Breeder seed is the progeny of__________________?
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A. Registered seed

B. Cenified seed

C. Foundation

D. Nucleus seed
186. The term gene was coined by__________________?
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A. Punned

B. Darlington

C. Johnnsen

D. Batson
188. Epitasis implies_____________________?
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A. One gene pair independently controls a phenotype

B. Many gene together control a parucular phenotype

C. One gene pair enhances phenotype expression of another gene pair

D. One pair of gene can completely mask the expression of another gene pair
189. In a monohybrid cross, 2 heterozygous individuals were crossed, phenotypic ratio came to be (2:1), it is due to__________________?
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A. Dominant lethal genes in homozygous individuals

B. Dominant lethal genes in heterozygous individuals

C. None of the above

D. Dominant epistasis

190. Synopsis occur in___________________?
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A. Mitosis

B. Amitosis

C. all the above

D. Meiosis
191. The mechanism ensuring genetic continuity in mitosis is____________________?
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A. Halving of chromosome nuriber between two daughter cells

B. Segregation of maternal and paternal characters

C. Crossing over of the genes

D. Formation of two daughter cells with identical DNA
192. Presence of slight differences in identical twins support the hypothesis that___________________?
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A. Dominance may be incomplete

B. Single gene may produce multiple effects

C. Genetic trails are influence by many genes

D. The environment effects the expression of genetic character
194. Electron microscope was invented by _________________?
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A. Robert Hook

B. Schwaan

C. Sigmund

D. Knoll and Risks
195. Male sterility in flowering plant was first reported by___________________?
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A. Gerstel (1900)

B. Koelreuter (1763)

C. Brewbaker (1810)

D. Stout (1917)

196. The nucleic acids comprise of_________________?
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A. DNA & RNA

B. RNA

C. DNQA and protein

D. DNA

198. which of the following probably occur when a diploid cell undergoes normal meiotic division________________?
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A. All dominant genes will segregate together into daughter cells

B. All linkage group will be disrupted

C. All homologous chromosome pairs will separate

D. All daughter cells will have different homologous chromosome pairs