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251.

Female Drosophila isA. Smaller in size than maleB. Larger in size than maleC. Larger in size with shorter life span than maleD. Having heteromorphic sex chromosomes

Answer» Correct Answer - B
252.

Linkage in plants was first shown inA. Zea maysB. Lathyrus odoratusC. Oenothera lamarckianaD. Pisum sativam

Answer» Correct Answer - B
Linkage in plants was first shown in Lathyrus odoratus (sweet pea).
253.

Lampbrush chromosomes are found insideA. Salivary gland of DropsophilaB. Salivary glands of silk mothC. Oocytes of frogD. Nucleus of man

Answer» Correct Answer - C
(c) The lampbrush chromosomes are found in oocytes of many vertebrates (Amphibian , reptiles , birds) and some invertebrates (insects) . They also occur in the giant nucleus of the unicellular algae Acetabulasia .
254.

Match the number of genes given in Column-I with names of organisms in Column-II and chosse the correct alternatives: A. A-2,B-1,C-5,D-3,E-4B. A-3,B-1,C-2,D-5,E-4C. A-3,B-2,C-1,D-5,E-4D. A-2,B-3,C-1,D-5,E-4

Answer» Correct Answer - B
255.

The condensation of the chromosomes are mamimal with visible centromeres at which phase of cell cycleA. `G_(1)` phaseB. S phaseC. `G_(2)` phaseD. M phase

Answer» Correct Answer - D
256.

Mirabilis jalapa showsA. CodominanceB. Incomplete DominanceC. dominanceD. Complementary genes

Answer» Correct Answer - B
257.

Which of the following is associated with multiple phenotypesA. EpistasisB. PleiotrpyC. polygenic inheritenceD. Mutation

Answer» Correct Answer - B
(b) Responsibility of a single gene for more than one phenotypic effect, often seemingly unrelated is known as pleiotropy.
258.

A cross in which an organism showing a dominant phentype is crossed with the recessive parent in order to know its genotype is called:A. Monohybrid crossB. Back crossC. Test crossD. Dihybrid cross

Answer» Correct Answer - C
(c) Test cross include cross of `F_(1)` of the recessive parents i.e., `(Ttxxtt)`
259.

Some of the dominant traits studied by Mendel wereA. Round seed shape , constricted pod shape and axial flower postionB. Green pod colour , inflated pod shape and axial flower positionC. Yellow seed colour , violet flower colour and greejn seed colourD.

Answer» Correct Answer - B
260.

Study of improvement of human race by providing idealn nature is Or Improvement of genetic characters and present day generation on the basis of best nultrition and training is calledA. EugenicsB. EupheniscC. EuthenicsD. None of these

Answer» Correct Answer - C
(c ) Euthenics is the impovement of human race by improving the enviromental conditions i.e ,by subjecting them to better nutrition beter unpollted ecological condition ,better eduaction etc.
261.

Change in sequence of nucleotide in in DNA is calledA. MutagenB. MutationC. RecombinationD. Translation

Answer» Correct Answer - B
262.

What is phenocopy?

Answer» The term phenocopy refers to an individual whose phenotype has been altered by environment to a state that resembles a phenotype associated with another genotype. Phenocopy is not inheritable.
263.

Mention the advantages of selecting pea plant for experiment by Mendel.

Answer» Mendal selected pea plant beaue of the following special features :
1. Garden peas were found to differ in certain definite and easily detectable traits.
2. The traits of each kind of pea plant were presented in generation after generation beacuse the plants and bisexual flowers and normally resorted to self pollination.
3. Artificial cross-pollination could be easily achieved by removing the stamens (emasculation).
4. Pea plants had a short life cycle.
5. Pea plants produced many seeds in one generation.
6. Mendel worked on only pure or true breeding trains, which means that a plant on self-pollination produces offspring with the same traits.
7. Pea plants having each of the seven characters hs selected were readily available.
264.

Which is correct?A. Birds have ZZ (female) -ZW (male) sex determinationB. Drosophila has XX-XY sex determinationC. Henking discovered Y-chromosomeD. Grasshoper show XX-XY sex determination

Answer» Correct Answer - B
Drosophila has XX-XY sex determination.
265.

Mutations are responsible forA. Extinction of organismB. Variations in populationC. Increase in populationD. Maintaining genetic continutiy

Answer» Correct Answer - B
Mutations are responsible for variations in population.
266.

Blue flowered and white flowered plant on crossing gave progeny of blue and white flowered in the ratio of 60:40 what ratio of blue and white is expected if the blue flowered are self pollinatedA. `76:24`B. `40:60`C. `52:48`D. `84:16`

Answer» Correct Answer - A
267.

Chromosomes Y isA. AcecentricB. MetacentricC. TelocentricD. Submetric

Answer» Correct Answer - A
268.

Nucleosome core is intimately associated withA. 160 bp of DNAB. 210 bp of DNAC. 250bp of DNAD. 100bp of DNA

Answer» Correct Answer - A
269.

Nucleosome are bounded byA. RNAB. Histone `H_(4)`C. Histone `H_(3)`D. DNA

Answer» Correct Answer - D
270.

Nucleosome areA. Units of DNAB. Units of RNAC. Units of proteinsD. Units of chromosomes

Answer» Correct Answer - D
(d) Woodcock termed each beaded structure on chromosome as nucleous . So nucleosome are units of chromosomes .
271.

The core of nuclesome is made up ofA. `H_(1)H_(2)A,H_(2)B,H_(3)`B. `H_(1)H_(2)A,H_(2)B,H_(3),H_(4)`C. `H_(2)H_(2)A,H_(2)B,H_(4)`D. `H_(2)H_(2),H_(2)B,H_(4)`

Answer» Correct Answer - D
(d) These are small proteins responsible for coiling DNA is to nucleosome .
272.

Nucleosome consistas ofA. NucleolusB. GenesC. MicrofilamentsD. Histones

Answer» Correct Answer - D
(d) Histones are main structural protein found in eukaryotic cells .
273.

Coupling and repulsion are the two faces ofA. Crossing overB. LinkageC. ChiasmataD. Mutation

Answer» Correct Answer - B
(b) The tendency of parental combinations to remain together, which is expressed in terms of low frequency of recombinations is called linkage.
274.

The four daughters cells derived from a single meiosis differ from each other due toA. Difference in chromosomes numberB. Crossing over onlyC. Independent assortment of chromosomes onlyD. Crossing over as well as independent assortment of chromosomes

Answer» Correct Answer - D
275.

A test cross is performed to knowA. Genotype of `F_(2)` dominantsB. Linkage between two traitsC. Number of alleles of a geneD. Success of intervarietal and interspecific cross.

Answer» Correct Answer - A
A test cross is performed to know genotype of `F_(2)` dominants.
276.

In case of incomplete deominance in `F_(2)` generationA. Genotypic ratio is 3:1B. Phenotypic ratio is 3:1C. Genotypic ratio =phenotypic ratioD. Nothing can be concluded

Answer» Correct Answer - C
Incomplete dominace shown the 1:2:1 phenotuypic and genotypic ratio.
277.

Branch of biology dealing with heredity and variation isA. EcologyB. EvolutionC. PaleontologyD. Genetics

Answer» Correct Answer - D
Genetics deals with the inheritance, as well as the variation for characters from parents to offspring.
Inheritance is the process by which characters are passed on from parent to progeny, it is the basis of heredity. Variation is the degree by which progeny differ from their parents.
278.

Longest chromosomes occur inA. LiliumB. Zea maysC. AlliumD. Trillium

Answer» Correct Answer - D
Longest chromosomes occur in Trillium.
279.

In which two ways numerical changes occur in the chromosomes?

Answer» Aneuploidy and polyploidy
280.

Mention the methods which cause morphological modifications of chromosomes

Answer» Deletion, inverion, translocation and duplication
281.

Name the two main types of mutations

Answer» Chromosomal and genic
282.

Who started the scientific study of mutations?

Answer» Correct Answer - Morgan
283.

How many linkage groups are found in man ?

Answer» Correct Answer - 23
284.

Genes located on same locus but having different expressions areA. Multiple alletesB. OncogenesC. PolygenesD. Co-dominants

Answer» Correct Answer - A
Genes located on same locus but having different expressions are multiple allelets.
285.

What occurs in point mutation?A. Change in single base pair in DNAB. Change in single base pair in RNAC. Change in double base pair in DNAD. Change in double base pair in RNA

Answer» Correct Answer - A
286.

Assertion : In a person with AB blood group, the erthrocyes carry both A and B antigenes on their surface. Reason : The allels `I^(A) and I^(B)`, that produe AB blood group, are codominant and both are expressed.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true and R is not the correct explanation of A.C. If A is true but R is falseD. If both A and R are false

Answer» Correct Answer - A
287.

Which of the following genotypes does notproduce any sugar polymer on the surface of the RBCA. `I^(A)I^(A)`B. `I^(B)i`C. `I^(A)I^(B)D. ii

Answer» Correct Answer - D
288.

Inheritance would be extranuclear in case ofA. Killer ParameciumB. Killer AmoebaC. EuglenaD. Hydra

Answer» Correct Answer - A
289.

Inheritance would be extranuclear in case ofA. Killer AmoebaB. Killer ParameciumC. Killer EuglenaD. Killer Hydra

Answer» Correct Answer - B
Inheritane would be extranuclear in case of killer Paramecium.
290.

"Cytochimeras" meansA. Cell having halodpidB. Cells having two nucleiC. Cells having different chromosomes other than vegetative cellsD. None of these

Answer» Correct Answer - C
(c) Chimeras are the individual having the different genotypes in its different parts .
291.

Linkage is broken byA. MeiosisB. MitosisC. Control formationD. DNA duplication

Answer» Correct Answer - A
292.

Which external trait determines sex correctlyA. Female Cockroach-Anal cerciB. Male shark-Claspers on pelvic finsC. Female Ascaris- Curved posterior endD. Male Frog-Copulatory pad on first digit of hind limb.

Answer» Correct Answer - B
External trait that determines sex in male shark are claspers on pelvic fins.
293.

A colour blind girl is rare because she will be only when :A. her mother and maternal grandfather were colourblindB. her father and maternal grandfather were colourblindC. her mother is colour blind and father has normal visionD. parents have normal vision but grand parents were colourblind

Answer» Correct Answer - B
For a girl to be colourblind, the genotype of her father should be `X^(C )Y` and of her mother either `X^(C )X` or `X^(C ) X^(C )`, where `X^(C )` represents colour blind gene.
294.

Mutation generally producesA. recessive genesB. lethal genesC. polygenesD. dominant genes

Answer» Correct Answer - A
Mutations generally produce recessive genes. Mutation is a sudden heritable change in the characteristics of an organism. The individual which shows these heritable changes is known as mutant.
295.

In hybridization `"Tt" xx "tt"` gives rise to the progeny in the ratio ?A. `2:1`B. `1:2:1`C. `1:1`D. `1:2`

Answer» Correct Answer - C
296.

Drosophila melanogaster possesssesA. 3 pairs autosomes + 1 pair sex chromosomesB. 2 pairs autosomes + 2 pair sex chromosomesC. 1 pair autosomes + 3 pair sex chromosomesD. 2 pairs autosomes + 1 pair sex chromosomes

Answer» Correct Answer - A
Drosophila melanogaster possesses 3 pairs autosomes + 1 pair sex chromosomes.
297.

Which is not an X- linked recessive disease?A. `beta`-thalassemiaB. HaemophiliaC. Colour blindnessD. Glucose-6-Phosphate dehydrogenase deficiency

Answer» Correct Answer - A
`beta`-thalassemia is an autosomal-linked recessive disease.
298.

Albinism is a congenital disorder resulting from the lack of the enzyme:A. TyrosinaseB. Xanthine oxidaseC. CatalaseD. Fructokinase

Answer» Correct Answer - A
299.

Barr body is observed inA. Basophils of maleB. Neutrophils of femaleC. Basophils of femaleD. Eosinophils

Answer» Correct Answer - B
Barr body is observed in neutrophils of female.
300.

Alleles that produce independent effects in their heterozygous condition are calledA. codominant allelesB. epistatic allelesC. complementary allelesD. supplementary alleles

Answer» Correct Answer - A
Codominant alleles produce independent effects in their heterozygous condition. Both the genes produce their independent effect.