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151.	If enough crosses are made between male flies of the genotype Aa and the female flies of genotype aa to produce about 1000 offsprings, which one of the following is the most likely distribution of genotype in the offsprings?A. 750 Aa: 250aaB. 481 Aa :519 aaC. 249 aa: 751 aaD. 243 AA: 517 aa:240 aa
Answer» Correct Answer - B

152.	In snapdragons, tall is dominant over dwarf and red colour of the flowere is incompletely dominant over the white and hybrid is pink. A pure tall white (TTrr) is crossed to a pure dwarf red (ttRR) and the plants of `F_(1)` - generation are self -fertilised. What will be the expected genotype of the `F_(2)` plants?A. 9:3:3:1B. 1:1:1:1C. 3:6:3:2D. All the plants will be phenotypically different
Answer» Correct Answer - C

153.	In `F_(2)` -generation how many shades of skin colur are obtained in polygenic inheritance?A. 4B. 6C. 7D. 9
Answer» Correct Answer - C

154.	Which Mendelian idea is depicted by a cross in which the `F_1` generation re- sembles both the parentsA. Law of dominanceB. Inheritance of one geneC. CodominanceD. Incomplete dominance
Answer» Correct Answer - C

155.	When dominant and recessive alleles express themselves together, it is calledA. CodominanceB. DominanceC. AmphidominanceD. Pseudodominance
Answer» Correct Answer - A

156.	Test cross in plants or in Drosophila involves crossing:A. Between two genotypes with recessive traitB. Between two F 1hybridsC. The `F_(1)` hybrid with a double recessive genotypeD. between two genotypes with dominant trait
Answer» Correct Answer - C

157.	When two unrelated individuals or lines are crossed, the performance of `F_(1)` hybrids is often superior to both its parents. The phenomenon is calledA. TransformationB. SplicingC. MetamorphosisD. heterosis
Answer» Correct Answer - D The superiority of hybrids over either of the parents (dominant or recessive ) is called hybrid vigour (G Shull) . Heterosis is equivalent of hybrid vigour.

158.	Assume that in mice, B = black fur, b = brown fur . If a heterozygous black mouse mates with a homozygous brown mouse, what per cent of teir offspring will have balcek fur?A. 0.25B. 0.5C. 0.75D. 1
Answer» Correct Answer - B

159.	Suppose, you wanted to know the genotype of one of the brown `F_(2)` mice in Q. 159. The easiest way to do would be toA. Keep careful records of the parent miceB. Mae it with a brown mouseC. Mate it with a mouse of its own genotypeD. Mate it with a white mouse
Answer» Correct Answer - D

160.	Which one of the following traits of Garden Pea studied by Mendel was a recessive feature ?A. Axial flower positionB. Green seed colourC. Green pod colourD. Round seed shape
Answer» Correct Answer - B

161.	Assertion : The genetic complement of an organism is called genotype Reason : Genotype is the type of hereditary propeties of an organism.A. Both Assertion and Reason ae true and the Reason is a correct explanation of the AssertionB. Both Assertion and Reason are true but the Reason is not the correct explanation of the AssertionC. Assertion is true, but the Reason is falseD. Assertion is false, but the Reason is true
Answer» Correct Answer - B Genotype is the bereditary properties of an organism and genetic complement of an organism.

162.	In poultry birds, the inheritance of combs is controlled byA. Duplicate genesB. collaborator geneC. complementary geneD. Both (a)and (b)
Answer» Correct Answer - B

163.	The modified dihybrid ratio of duplicate genes isA. 0.37917824074074B. 0.54375C. 0.62569444444444D. 0.50212962962963
Answer» Correct Answer - C

164.	A modified dihybrid mendelian ratio of 9:3:4 indicatesA. supplementary geneB. complementary geneC. lethal genesD. epistatic genes
Answer» Correct Answer - A

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