InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Balbiani rings are present inA. PolysomesB. AutosomesC. Polytene chromosomesD. None of these |
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Answer» Correct Answer - C (c) Polytene chromosomes was described by Kollar (1882) and first reported by Ballbiani(1881) . They are found in salivary glands of insects (Drosophila) and called as salivary gland chromosomes . |
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| 2. |
Balbiani discovered special type of chronomus larva which are recognized by the presence ofA. BandsB. LoospsC. Both bands and loopsD. All the above |
| Answer» Correct Answer - C | |
| 3. |
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected which of the following mode of inheritance do you suggest for this diseaseA. Autosomal dominantB. Sex-linked dominantC. Sex-limited recessiveD. Sex-linked recessive |
| Answer» Correct Answer - D | |
| 4. |
During organ differentiation in Drosophila, an organ is modified to another organ (such as wings may be replaced by legs). Genes responsible for such metamorphosis are calledA. double dominant genesB. plastid genesC. complementary genesD. homeotic genes |
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Answer» Correct Answer - D Homeotic genes are control genes which either be getting expressed or by remaining silent during development, influence the differentiation of organs. These have been found in insectsn one nematode and some plants. A DNA sequence called homeobox, present in these genes, is involved in specification of organs. A mutation that causes a body part to develop in appropriate position in an organism, is called homeotic mutation, e.g. in Drosophila, such mutation may cause legs to develop on the head in place of antennae. |
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| 5. |
Individuals having homomorphic sex-chromosomes produceA. Only one gamete in complete life spanB. One type of gametesC. No gametesD. Two type of gametes |
| Answer» Correct Answer - B | |
| 6. |
One functional unit of gene which specifies synthesis of one polypeptide is known as Or The equivalent of a structural geneA. ReconB. CloneC. CodonD. Cistron |
| Answer» Correct Answer - D | |
| 7. |
The idea of mutains was brought forth byA. Hugo de Vries who worked on evening primroseB. Gregor Mendel who worked on Pisum sativumC. Hardy Weinberg who worked on allele frequencies in a populationD. Charles Darwin who observed a wide variety of organisms during sea voyage. |
| Answer» Correct Answer - A | |
| 8. |
Both alleles express in heterozygote when they areA. lethalsB. co-dominantsC. semi-dominantsD. recessive allele |
| Answer» Correct Answer - B | |
| 9. |
Depending upon the distance between any two genes, which is inversely proportional to the strength of linkage, cross overs will vary fromA. `50-100%`B. `0-50%`C. `75-100%`D. `100-50%` |
| Answer» Correct Answer - B | |
| 10. |
Depending upon the distance between any two genes, which is inversely proportional to the strength of linkage, cross overs will vary fromA. 50-100%B. 0-50%C. 75-100%D. 100-150% |
| Answer» Correct Answer - B | |
| 11. |
Which of the following statement for chromosomal theory of inheritance is incorrect ?A. Pairing and saparation of a pair o chromosomes would lead to the segregation of a factor they carriedB. Beheviour of chromosomes is parallel to the behaviour of genesC. The two alleles of a gene pair one located on homologous sites on homologous chromosomesD. Chromosomes as well as genes occur in pairs |
| Answer» Correct Answer - A | |
| 12. |
Solenoid is sa structure ofA. Nuccleosomal organization with 10nm thicknessB. Condensed chromatin fibre with 30nm diameterC. Highly condensed from o fchromatid with 300nm thicknessD. Well organised chromtid with 700nm thickness |
| Answer» Correct Answer - B | |
| 13. |
Chromosomal theory of inheritance was given byA. Gregor Johann MendelB. Hugo de VariesC. Landon DownD. Thomas Hunt Morgan |
| Answer» Correct Answer - D | |
| 14. |
Experimental verification of the chromosomal theory of inheritance was given byA. Sutton & BoveriB. CorrensC. T.H. MorganD. Tschermak |
| Answer» Correct Answer - C | |
| 15. |
Select the odd one out w.r.t chromosomal theory of inheritanceA. It was proposed by Sutton and BoveriB. Behaviour of chromosomes is parallel to behaviour of genesC. Chromosomes and genes occur in pairs in diploid cells respectivelyD. The paired condition of both chromosomes as well as Mendellan factors is restored during fertilization |
| Answer» Correct Answer - C | |
| 16. |
On which plan did Mendal Work? |
| Answer» Correct Answer - Garden pea. | |
| 17. |
The theory of recombinaiton of linked gene due to the crossing over of chromosome during zygotene of meiosis put forwarded byA. T.H.MorganB. PunnetC. MendelD. Connes |
| Answer» Correct Answer - A | |
| 18. |
Who had proposed the chromosomal theory of inheritance? |
| Answer» Sutton and Boveri proposed the chromosomal theory of inheritance in 1902. They linked the inheritance of traits to the chromosomes. | |
| 19. |
"One gene one enzyme" theory was proposed byA. G.W. Beadle and E.L. TatumB. O.T.Avery and M.McCarthyC. J.H. Tijo and A. TijoD. C.E. Ford and J.H. Tijio |
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Answer» Correct Answer - A (a) This theory was given by Beadle and Tatum (1958) , while they were working on red mould or neurospora . |
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| 20. |
Which organism was used by Beasdle and Tatum to proposed one gene one enzyme hypothesisA. E.coliB. NostocC. DrosophilaD. Neurospora |
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Answer» Correct Answer - D (d) Neurospora (ascomycetes fungus) which is also called Drosophila of plant kingdom. |
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| 21. |
During the studies on genes in Drosophila that were sex-linked T.H. Morgan found F2-populabon phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at. |
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Answer» T.H. Morgan worked on Drosophila melangaster. These aere found suitable for studeis in genetices for the followigng reasons : 1. These can be grown on simple syntetic medium in laboratory. 2. They complete their life cycle in about two weeks. 3. He carried out many dihybrid crosse in this organism. He observed that two genes under consideration in his experiment did not seggregated independently as in the case of characters studied by Mendel. |
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| 22. |
A gene showing codominance has:A. Alleles tightly linked on the same chromosomeB. Alleles that are recessive to each otherC. Both alleles independently expressed in the heterozygoteD. One allele dominant on the other |
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Answer» Correct Answer - C A gene showing co-dominance has both alleles independently expressed in the heterozygote. |
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| 23. |
A gene showing codominance hasA. one allele dominant on the otherB. alleles tightly linked on the same chromosomeC. alleles that are recessive to each otherD. Both alleles independently expressed in the heterozygote |
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Answer» Correct Answer - D A gene shows codominance when both alleles in heterozygous condition, express their traits independtly instead of showing dominant-recessive relationship and such alleles are called codominant alleles. |
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| 24. |
The mechanism that causes a gene to move from one linkage group to another is calledA. inversionB. duplicationC. translocationD. crossing over |
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Answer» Correct Answer - C Translocation is the process causing a gene to move from one linkage group to another. It is the separation of a chromosome segment and its union to a non-homologous chromosome. It is of two types-simple and reciprocal In simple translocation one chromosome shows deletion or deficiency while a nonhomologous chromosome comes to have an additional segment. In reciprocal translocation two non - homologous chromosomes exchange segments between themselves to create new linkage groups in both the chromosomes Hence, option (c ) is correct. |
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| 25. |
the mechanism that causes a gene to move from one linkage group to another is called :A. inversionB. DuplicationC. translocationD. crosing-over |
| Answer» Correct Answer - C | |
| 26. |
Which one of the following conditions though harmful in itself ,is also a potential saviour from a mosqutio borne infectious disease?A. ThalassemiaB. Sickle cell anaemiaC. LeukemiaD. Pernicious anaemia |
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Answer» Correct Answer - B A harmful condition which is also a potential saviour from a mosquito borne infections disease is sickle cell anaemia. |
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| 27. |
Which of the following chemical is a base analogue ?A. 5-bromouracilB. AcridinesC. Nitrous acidD. Hypoxanthine |
| Answer» Correct Answer - A | |
| 28. |
Trisomy has chromosome complement ofA. 2 n - 1B. 2 n - 1 -1C. 2 n + 1 +1D. 2n + 1 |
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Answer» Correct Answer - D Trisomy has chromosome complement of 2n + 1. |
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| 29. |
In which of the following colourblindn ess si inheritedA. In males onlyB. Both the sons and daughters are colourblindC. In both males and femaleD. In none of the above |
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Answer» Correct Answer - C (c ) Colour blidnesss is X linked recessive and woman in homozyygous condition . |
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| 30. |
Peraons who are colour blind cannot disinguisgA. Red and greenB. Block and yellowC. Green and blueD. Yellow and white |
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Answer» Correct Answer - A (a) Colur blind person is unble to distingusdh primary coplour viz red and green. |
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| 31. |
Sex -linked genes of man areA. Present on X-chromosomeB. Present on autosomesC. Present on short arm (p) of Y-chromosome present on long arm (q) Of Y-chromosomeD. Present on long arm (q) of Y-chromosome |
| Answer» Correct Answer - A | |
| 32. |
The distance between two genes in a chromosome is measured in cross unitsin which presentA. Ratio of crossing over between themB. Percentage of crossing over between themC. Number of crossing over between themD. None of these |
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Answer» Correct Answer - B (b) The cross over percentage differ for different pairs of genes because the amount of crossing over depend on the frequency with which breaks in the chromatids occur between the two genes . This frequency further depends specially on the distance of these genes which are apart on the chromatids. |
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| 33. |
Total collection of genes at any time in a unit of evolution is Or The sum of genes ina populaltiona is calledA. Gene bankB. germplasm collectionC. Gene libraryD. Genome |
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Answer» Correct Answer - D (d) The gene pool can be defined , 'as the aggregation of all gene in a medelian population ' . Mendelian population is an inter breeding group of population which occurs as a community in an area . |
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| 34. |
The symbol of empty circles used in pedigree analysis representsA. Normal femalesB. Normal malesC. Affected femalesD. Affected males |
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Answer» Correct Answer - A The symbol of empty circles used in pedigree analysis represents normal females. |
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| 35. |
In pedigree analysis, symbol given for sex unspecified isA. B. C. D. |
| Answer» Correct Answer - A | |
| 36. |
Who is know as father of physiological genetics or father of biochemical geneticsA. SlatyperB. Charles EltonC. TaylorsD. Archibald Garrod |
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Answer» Correct Answer - D (d) Sir Archibald Edward garrod was an Enlish phsician who pionneered the field of novemeber 25,1857 in london and died on march 28,1936 ,in cambidahe. |
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| 37. |
Assertion : Kinetochor helps in the movement of chromosomes. Reason : It has points for attachment of microtubules .A. If both the assertion and the reason are true and the reasons is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reson is falseD. If both the assertion and reason are false |
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Answer» Correct Answer - A The surface of cenfromere bears a special trilaminar plate called kinetochore. Kinetochore has points for attachment of microtubules. Microtubules produce chromosome fibres or tactile fibrills require for the movement of chromosomes during anaphase. |
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| 38. |
Human chromosomes have been grouped on the basis of size and centromere into typesA. 5B. 6C. 7D. 10 |
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Answer» Correct Answer - C Human chromosomes have been grouped on the basis of size and centromere into seven types |
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| 39. |
Centromere is a part of chromosomes which helps in theA. Divison of centrosomesB. Formation of spindle fibresC. Movementof chromosomesD. Formation of nuclear spindle |
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Answer» Correct Answer - C (c) Centromere joins the microtubules of chromosomal spindle fibres and help in the movement of chromosome during cell division. Centromere also plyas an important role in the polymerization of tubulin protein used in the formation of microtubules. Hence it is helpful in attaching the chromosome with spindle fibres. |
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| 40. |
Inversion without involving the centromere is calledA. ParacentricB. MonosomyC. PericentricD. Tautomerization |
| Answer» Correct Answer - A | |
| 41. |
Epistasis and dominance are respectivelyA. Intragenic, IntergenicB. Non-allelic, Extra-allelicC. Non-allelic , InterallelicD. Intergenic, Non-allelic |
| Answer» Correct Answer - C | |
| 42. |
The gene intraction when on egenes masks the effect or When a gene pair hides the effect of another, the phenomenon is calledA. Complementry genes actionB. Supplementry gene actionC. Duplicate genes actionD. Epistasis |
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Answer» Correct Answer - D (d) In epistasis, an allele of one gene suppressed or masked the phenotypic expression of a gene at another locus. The gene which is masked is called hypostatic gene. |
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| 43. |
The phenotypic ratio obtained in quantitive inheritance of a dihybrid cross is or In a cross between red kernelled and white kernelled varities of wheat showingf polygenic inheritence the phenotypic inheritence the phenotypic ratio in `F_(2)` generation will beA. `1 : 2 : 1`B. 1 : 4 : 6 : 4 : 1C. 1 : 6 : 15 : 20 : 15 : 6 : 1D. 9 : 3 : 3 : 1 |
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Answer» Correct Answer - B (b) Ratio 1:4:6:4:1 it is due to two pairs of genes. But if it is due to 3 pairs of genes, the size ratio shall be 1:6:15:20:15:6:1. |
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| 44. |
Genes for cytoplasmic male sterlity in plants are generally located in or in a cross between red kernelled and white kernelled varities of wheat showing polygenic inheritence the phenotypic ratio in `F_(2)` generation will beA. Mitochondrial genomeB. CytosolC. Chloroplast genomeD. Nuclear genome |
| Answer» Correct Answer - A | |
| 45. |
Which one of the followingt is the most suitable medium for culture of Drosophila melanogasterA. Moist breadB. Agar agarC. Ripe bananaD. Cow dung |
| Answer» Correct Answer - C | |
| 46. |
Which phenomenon strongly favours the linear arrangement of genes on the chromosomes? Define the phenomenon and give the situation where this phenomenon cannot occur. |
| Answer» The phenonmenon, that strongly favours the linear arrangment of genes on the chromosomes, is linkage. Linkage is the tedency for alleles of different genes to pass together from one generation to the next. The genes located on different chromosomes cannot show any linkage. | |
| 47. |
Barchydactyly is due toA. Dominant gane on the autosomeB. Recessive gane on the autosomeC. Dominant gane on the sex sutosomeD. None of the above |
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Answer» Correct Answer - A (a) Brachydactyly is a disease characterized by small sized finger and is due to dominat gene on the autome . |
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| 48. |
In our society women are balmed for producing female children. Choose the correct answer for the sex- determination in humansA. Due to some defect like aspermia in manB. Due to the genetic make up of the particular sperm which fertilizes the eggC. Due to the genetic make up of the eggD. Due to some defect in the women |
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Answer» Correct Answer - B Sex is deterction at fertiliztion by the nature of the sperm that fertilizes the egg. |
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| 49. |
A colourblind daughter is born whenA. Father is colourblind mother is noramalB. Mother of colourblind ,father is normalC. Mother is carrier ,father is normalD. Mother is carrer ,father is colourblind |
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Answer» Correct Answer - D (d) For a woman to be colourblind both her X chomoses should bear gens for the disease , which is possible is rther colourblind or a carrir of disease .which is possible only when her father is colourblind and her mother is either colourblind or a carrier of disease. |
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| 50. |
A man known to be victim of haemophilia marries a normal woman whose father was known to be a bleeder. Then it is expected thatA. All their children will be bleedersB. Half of their children will be bleedersC. One fourth of their children will be bleedersD. None of their children will be bleeder |
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Answer» Correct Answer - B Since woman is normal and her father was a bleeder means she is a carrir and as she marries a victimi of be diseased. |
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