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451.

Substitution of a purine with another type of purine is calledA. TransversionB. TransitionC. InversionD. Translocation

Answer» Correct Answer - B
452.

Find the incorrect matchA. Somatic mutation - No evolutionary importanceB. Germinal mutation - Gametic mutationC. Frame shift mutation - Gibberish mutationD. Chromosomal mutation - Transversion

Answer» Correct Answer - D
453.

Mark the odd one (w.r.t genomatic mutation)A. HypoploidyB. TetrasomyC. DuplicationD. Allopolyploidy

Answer» Correct Answer - C
454.

A : Antlers in male deer are sex influenced traits. R : These are controlled by autosomal genes which are influenced by the sex of bearer.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark (2)C. If Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - D
455.

All sex limited traits, exceptA. Beard in manB. Porcupine skinC. Antlers in male deerD. Brilliant plumage in peacock

Answer» Correct Answer - B
456.

Select the correct mactchA. Sex-limited trait - Colour blindnessB. Sex-limited trait - Express in both sexesC. Sex-influenced trait - More frequent in one sex than in the otherD. Sex-influenced trait - Porcupine skin

Answer» Correct Answer - C
457.

Environmental mechanism of sex-determination is seen inA. BonneliaB. CrepidulaC. GrasshopperD. More than one option is correct

Answer» Correct Answer - D
458.

A : Non-allosomic genic determination of sex is found in bacteria. R : Sex is dependent on some environmental factors in prokaryotes.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark (2)C. If Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - C
459.

A : Non-allosomic genic determination of sex is found in bacteria. R : Such traits show ris-cross inheritance.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark (2)C. If Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - B
460.

The most likely reason for the development of resistence against pesticides in insects damaging a crop isA. Directed mutationB. Acquired heritable changeC. Rndom mutationsD. Genetic recombination

Answer» Correct Answer - B
461.

Selecte the correct statement.A. Franklin Stahl coined the term 'linkage'B. Punneet square was developed by a British scientistC. Spliceosomes take part in translationD. transduction was discovered by S. Altman

Answer» Correct Answer - B
462.

Barr body in mammals representA. All the heterochromatin in male and female cellsB. The Y-chromosome in somatic cells of maleC. All the heterochromatin in female cellsD. One of the two X-chromosomes in somatic cells of females

Answer» Correct Answer - D
463.

Pure homozygous offpriings in a silhbrid cross in the `F_(2) ` generation will beA. `1//2`B. `1//4`C. `1//8`D. `1//16`

Answer» Correct Answer - C
(c) `1//8`, because in `F_(2)` generation by dihybrid cross 16 hybrids are formed in which only 2 are homozygous for dominant and recessive character. The genotypic ratio for homozygous and heterozygous sets of gene is 2:14. It is `1//8` of the 16 hybrids.
464.

Wilson detected colour blindness inA. 1921B. 1911C. 1910D. 1914

Answer» Correct Answer - C
Wilson detected colour blindness in 1910.
465.

Howmany types of gemete will be produced by an individual having genotype AaBbcc:A. 1B. 2C. 3D. 4

Answer» Correct Answer - d
466.

What kind of evidences suggested that man is more closely related with chimpanzee than with other hominoid apes?A. Evidence from DNA from sex chromosomes onlyB. Comparison of chromosomes morphology onlyC. Evidence from fossil remains, and the fossil mitochondrial DNA aloneD. Evidence from DNA extracted from sex chromosomes , autosomes

Answer» Correct Answer - D
467.

Mendlism is related withA. Heredity in lving beingsB. Meiosis during sexual reproductionC. Mutton in living organismsD. None of the above

Answer» Correct Answer - A
(a)Gregor johan mendel was the first to fomula clear cut laws of heredity.
468.

In certain cell, recombination can occur duringA. MeiosisB. AmitosisC. MitosisD. Both (a) and (b)

Answer» Correct Answer - A
469.

Turner syndrome isA. XOB. XXYC. XXXD. XYY

Answer» Correct Answer - A
470.

The cause of Cat-cry syndrome is due toA. Loss of a segment of X-chromosomeB. Loss of a segment of `5^(th)` chromosomeC. Loss of segment of Y-chromosomeD. None of the above

Answer» Correct Answer - B
(b) cat -cry or cri-due chat sydroome is caused by the deletion of shortarm of chromosome number 5 `(5P^(-)` So the genotype of affected indiviual in 46 ,XX,5p in female and 46,XX,`5p^(-)`in males.
471.

Study of human race is calledA. EugenicsB. EntomologyC. EcologyD. Pathology

Answer» Correct Answer - A
(a) Eugnis is the study of possiblity of improving humanity by altering its genetic compoition by encourging breeding of htose presumed to have desirable genes and discouraging breeding of htose presumed to have underessirable ganes.
472.

Edward syndrome is on account of ………….A. 45 chromosmes instead of46B. Presence of three chromosomes on 18th pair of autosomeC. Presence of three chromosomes on 21st pair of autosomeD. Presence of three pair of sex chromosomes

Answer» Correct Answer - B
It has an abnormal karyotype of `10 2 n + 1 (18) = 47`
473.

Eugenics pertains toA. Improvement of mankind by improving his heredityB. Preservating human sperms for articficial inseminationC. Study of human geneticsD. Controlling size of a human familiy

Answer» Correct Answer - A
(a) Eugenis is the branch of science which dels with improvement of human race genetically .
474.

Mendel enuncitedA. Two priciples of inheritanceB. Three priciples of inheritenaceC. Four principles of inhertanceD. Five principles of inhertiance

Answer» Correct Answer - B
(b) He enunciated three major principles of inheritance i.e., Law of dominance, law of segregation and law of independent assortment.
475.

Law of mendel are valid forA. Asexual reproducationB. Sexual reprodutionC. Vertagetive reproducationD. All above

Answer» Correct Answer - B
476.

Which of the following match is correctA. Indepent assortment - segregation of factorB. Lamarck -natural sectionC. Hatch and slack-chemiosmotic heoryD. Peter mitchell -proposed Z scheme

Answer» Correct Answer - A
477.

The first law of mendelA. Law of inhertanceB. Law of variationC. Law of indepent assormentD. Law of segregation

Answer» Correct Answer - D
(d) Mendel gave only two laws of gentics. First law is segregation and second law is Idependent assortment.
478.

Haemophiliais more commonly seen in human males than in human females becauseA. Thi disease is due to an X-linked dominant mutationB. A greater proportion of girls die in infancyC. This disease is due to an X-linked recessive mutationD. This disease is due to a Y-linked recessive mutation

Answer» Correct Answer - C
479.

Haemophilia is more commonly seen in human males than in human females becauseA. this disease is due to an X-linked dominant mutationB. a greater proportion of girls die in infancyC. this disease is due to an X-linked recessive mutationD. this disease is due to a Y-linked recessive mutation

Answer» Correct Answer - C
Haemophilia, hereditary (recessive X-linked) disease is caused due to fault in genes controlling the factor VIII and IX, located on X-chromosome. The male carries only one X-chromosome, other sex chromosome carries no genes for blood clotting, so the condition is usually seen only in males where only one faulty chromosome is needed.
While a female with one faulty X-chromosome will be carrier. So, in females two faulty X-chromosomes are needed to cause the disease.
480.

Haemophilia is more common in males than females, because it isA. Dominant autosomalB. Dominant X-linkedC. Recessive X-linkedD. X-linked.

Answer» Correct Answer - C
Haemophilia is more common in males than females, because it is recessive X-linked.
481.

Haemophilia is more common in males because it is aA. recessive character carried by Y-chromosomeB. dominant character carried by Y-chromosomeC. dominant trait carried by X-chromosomeD. recessive trait carried by X-chromosome

Answer» Correct Answer - D
Haemophilia is a disorder, which is sex-linked (X-chromosome) recessive condition. Males have only one X-chromosome, so this disease appears in them more then female as they have 2X-chromosomes.
482.

Both husband and wife have normal vision though their father were colour blind and mother did not have any gene for colour blindness .The probability of their daughter becoming colour blind is :A. `0%`B. `25%`C. `50%`D. `75%`

Answer» Correct Answer - A
In this case when the fathers of both husband and wife were colour blind and they have normal vision, husband have normal vision while wife is carrier of this disease.
Daughter of such parents will be carrier but there is no chance of her to be colour blind.
483.

The point mutations A to G,C to T, C to G and T to A in DNA areA. Transition, transition, transversion and transversion respectivelyB. Transition, transversion, transition and transversion respectivelyC. Transversion, transversion, transition and transition respectivelyD. All four are transition

Answer» Correct Answer - A
In transition, purine replace purine and pyrimidine replaces pyrimidine and in transversion, a purine is replaced by pyrimidine or vice versa.
484.

Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted onA. Althea roseaB. Pisum sativumC. Drosophila melanogasterD. Oenothera lamarckiana

Answer» Correct Answer - D
De Vries observed a number of mutation in his experimental plant evening primrose, oenothera lamarckiana.
485.

A hereditary disease which is never passed on from father to son isA. Autosomal linked diseaseB. X-chromosomal linked diseaseC. Y-chromosomal linked diseaseD. None of these

Answer» Correct Answer - B
Because father can gives only Y- chromosome to their son.
486.

The name chromatin was coined byA. FlemmingB. Robert brownC. George PaladaD. Camillio Golgi

Answer» Correct Answer - A
487.

Ratio of progeny when a red coloured heterozygote is crossed with a white coloured plant in which red colour in dominant to white colour:A. `3:1`B. `1:1`C. `1:2:1`D. `9:3:3:1`

Answer» Correct Answer - B
(B) The cross of heterozygous dominant with its recessive parent is called test cross the test coss gives `1:1`
488.

Some genes in bacteria and virus mau bcode for more than one polypetide, they are called inA. Overlapping genesB. Jumping geneC. Split geneD. None of these

Answer» Correct Answer - A
489.

Fruit colour in Cucurbita pepo is an example ofA. Complementary genesB. Duplicate genesC. Dominant epistasisD. Polymeric genes

Answer» Correct Answer - C
490.

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes areA. `n = 21` and `x = 7`B. `n = 7` and `x = 21`C. `n = 21` and `x = 21`D. `n = 21` and `x = 14`

Answer» Correct Answer - A
491.

A woman has an X-linked condition on one of her X chroomsomes , this chromosome can be inherited byA. Only duaghtersB. Only sonsC. Only grandhchildrenD. Both sons and daughters

Answer» Correct Answer - D
492.

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female childA. two X chromosomesB. only one Y chromosomeC. only one X chromosomeD. one X and one Y chromosome

Answer» Correct Answer - A
493.

A common test to find the genotype of a a hybird is byA. Crossing of one `F_(2)` progeny with male parentB. Crossing of one `F_(2)` progeny with femaleC. Studying the sexual behaviour with male parebntD. Crossing of one `F_(1)` progeny with male parent

Answer» Correct Answer - D
494.

Hogo de Vries gave his mutation theory on organic evolution while working on `:`A. Pisum sativumB. Drosophila melanogasterC. Oenothera lamarckianaD. Althea rosea

Answer» Correct Answer - C
495.

`9 : 3 : 3 : 1` ratio is modified to `9 : 7` ratio due toA. Complementry genesB. Epistasis geneC. Hypostatic geneD. Supplementry genes

Answer» Correct Answer - A
(a) The complementary genes are two pairs of non allelic genes which interact to produce only one phenotypic trait, but neither of them if present alone produces the phenotypic trait in the absence of other.
496.

Complete dominance is absent in or Incomplete dominance is shown byA. Pisum sativumB. Mirabilis jalapaC. Lathyrus odoratusD. Oenothera lamarckina

Answer» Correct Answer - B
(b) Mirabilis jalapa shows incomplete dominance.
497.

Cytoplasmic male steritiy in maize is due to defectiveA. MitochondriaB. LysosomeC. Golgi bodyD. Leucoplast

Answer» Correct Answer - A
498.

The two eucaryotic organelles responsible for cytoplasmic inheritance areA. Lysosomes and mitochondrisB. Chloroplasts and lysosomesC. Mitochondria and chloroplastsD. Mitrochondria and Golgi complex

Answer» Correct Answer - C
The two eukaryotic organelles responsible for cytoplasmic inheritance are mitochondria and chloroplasts.
499.

In humans blue eye colour is recessive to brown eye colour. If a boy has brown eyes and mother blue-eyed, what would be phenotype of father ?A. Block eyeB. Brown eyeC. GreenD. Blue eye

Answer» Correct Answer - B
500.

A : In snapdragon, `F_(1)` plants do not have red or white flowers. R : It is intermediate inheritance with neither of the two alleles of a gene being dominant over each other.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark (2)C. If Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - A