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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 7151. |
Mongolism syndrome is caused by [AFMC 1985, 86] |
| A. | One extra chromosome |
| B. | One extra sex chromosome |
| C. | One extra chromosome in 21st pair |
| D. | One less sex chromosome |
| Answer» D. One less sex chromosome | |
| 7152. |
Given below is the representation of a kind of chromosomal mutation What is the kind of mutation represented [AFMC 1997; AIIMS 2004] |
| A. | Deletion |
| B. | Duplication |
| C. | Inversion |
| D. | Reciprocal translocation |
| Answer» D. Reciprocal translocation | |
| 7153. |
The condition in which there are more than two complete set of chromosome is called [MP PMT 2003] |
| A. | Polytene |
| B. | Monoploidy |
| C. | Polyploidy |
| D. | Aneuploidy |
| Answer» D. Aneuploidy | |
| 7154. |
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder [CBSE PMT 2003] |
| A. | 0.25 |
| B. | 1 |
| C. | 0.75 |
| D. | 0.5 |
| Answer» E. | |
| 7155. |
Which pair of chromosomes is concerned with Down's syndrome [MP PMT 1992; CBSE PMT 2002; CPMT 2002; BVP 2002; MH-CET 2002; DPMT 2003] |
| A. | 7th |
| B. | 18th |
| C. | 21st |
| D. | 23rd |
| Answer» D. 23rd | |
| 7156. |
Philadelphia chromosome is [MH CET 2002] |
| A. | 13th chromosome |
| B. | 22nd chromosome |
| C. | 17th chromosome |
| D. | 21st chromosome |
| Answer» C. 17th chromosome | |
| 7157. |
The number of chromosomes in Klinefelter?s syndrome is [CPMT 1995; MP PMT 2003; DPMT 2004] |
| A. | 47 (44 + XXY) |
| B. | 47 (44 + XXX) |
| C. | 47 (46 + 1 chromosome 21) |
| D. | None of these |
| Answer» C. 47 (46 + 1 chromosome 21) | |
| 7158. |
Polydactyly in man is due to [J & K CET 2002] |
| A. | Autosomal dominant gene |
| B. | Autosomal recessive gene |
| C. | Sex-linked dominant gene |
| D. | Sex-linked recessive gene |
| Answer» B. Autosomal recessive gene | |
| 7159. |
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation [MP PMT 2002] |
| A. | Indirect suppression |
| B. | Intergenic mutation |
| C. | Intragenic mutation |
| D. | Suppressor mutation |
| Answer» E. | |
| 7160. |
Which one in man is a wholly genetic trait [CPMT 1977; AFMC 1985] |
| A. | Diptheria |
| B. | Leucoderma |
| C. | Albinism |
| D. | Tuberculosis |
| Answer» D. Tuberculosis | |
| 7161. |
A person may have one gene for normal haemoglobin and one gene for sickle cell haemoglobin. This heterozygous condition is called [BHU 2002] |
| A. | Genome |
| B. | Anaemia |
| C. | Gene trait |
| D. | Sickle cell trait |
| Answer» E. | |
| 7162. |
Alkaptonuria is caused due to [JIPMER 2002] |
| A. | Dominant autosomal gene |
| B. | Recessive autosomal gene |
| C. | X linked recessive gene |
| D. | X linked dominant gene |
| Answer» C. X linked recessive gene | |
| 7163. |
Epicanthus is the symptom of [KCET 2001] |
| A. | Haploidy |
| B. | Heteroploidy |
| C. | Turner?s syndrome |
| D. | Down?s syndrome |
| Answer» E. | |
| 7164. |
Discontinuous variations are [AIIMS 2001] |
| A. | Mutations |
| B. | Acquired characters |
| C. | Essential features |
| D. | Nonessential features |
| Answer» B. Acquired characters | |
| 7165. |
Mutation caused by a mutagen is [BVP 2001] |
| A. | Natural |
| B. | Chemical |
| C. | Spontaneous |
| D. | Induced |
| Answer» E. | |
| 7166. |
Who reported that Down's syndrome is due to extra 21st chromosome [BVP 2000] |
| A. | J.L. Down (1866) |
| B. | Lejeune (1959) |
| C. | Kinefelter (1942) |
| D. | Huntington (1872) |
| Answer» B. Lejeune (1959) | |
| 7167. |
Normally DNA molecule has A-T, G-C pairing. However, these bases can exist in alternative valency status, owing to rearrangements called [BHU 2000] |
| A. | Point mutation |
| B. | Analogue substitution |
| C. | Frame-shift mutation |
| D. | Tautomerisational mutation |
| Answer» E. | |
| 7168. |
The reason of fault in gene duplication is [RPMT PMT 1999] |
| A. | Transformation |
| B. | Translocation |
| C. | Mutation |
| D. | None of these |
| Answer» D. None of these | |
| 7169. |
Mental retardation in man, associated with sex chromosomal abnormality is usually due to [CBSE PMT1998] |
| A. | Reduction in X complement |
| B. | Increase in X complement |
| C. | Moderate increase in Y complement |
| D. | Large increase in Y complement |
| Answer» C. Moderate increase in Y complement | |
| 7170. |
Traits controlled by genes located on autosomes are said to be [BHU 1985] |
| A. | Sex affected |
| B. | Sex influenced |
| C. | Sex linked |
| D. | Genetic traits |
| Answer» E. | |
| 7171. |
The formation of multivalents at meiosis in diploid organism is due to [CBSE PMT 1998] |
| A. | Monosomy |
| B. | Inversion |
| C. | Deletion |
| D. | Reciprocal translocation |
| Answer» E. | |
| 7172. |
In human beings, multiple genes are involved in the inheritance of [CBSE PMT 1999] |
| A. | Colourblindness |
| B. | Phenylketonuria |
| C. | Sickle-cell anaemia |
| D. | Skin colour |
| Answer» E. | |
| 7173. |
Gynaecomastia is the symptom of [DPMT 2004] |
| A. | Down syndrome |
| B. | SARS |
| C. | Turner's syndrome |
| D. | Klinefelter's syndrome |
| Answer» E. | |
| 7174. |
Which of the following is not X-linked recessive [AMU 2005] |
| A. | Haemophilia-A |
| B. | Colour blindness |
| C. | \[\beta -\]Thalasemia |
| D. | G-6 PD deficiency |
| Answer» D. G-6 PD deficiency | |
| 7175. |
A mutation is most likely to have a selective advantage in evolution if [CPMT 2005] |
| A. | It affects dominant genes |
| B. | It affects recessive genes |
| C. | It affects whole chromosomes |
| D. | The environment remains stable |
| Answer» C. It affects whole chromosomes | |
| 7176. |
Mutation rates are affected by [MP PMT 1997] |
| A. | Temperature |
| B. | X-rays |
| C. | Gamma and beta radiation |
| D. | All of the above |
| Answer» E. | |
| 7177. |
Which one of the following is not a mutagen [MP PMT 1995, 97; 2000] |
| A. | Ethyl methane sulphonate |
| B. | Acetic acid |
| C. | Nitrous acid |
| D. | Ethylene oxide |
| Answer» C. Nitrous acid | |
| 7178. |
Height is [CPMT 2005] |
| A. | Somatogenic variation |
| B. | Discontinuous variation |
| C. | Continuous variation |
| D. | Blastogenic variation |
| Answer» D. Blastogenic variation | |
| 7179. |
If mother and father both are without pigments (albinism), then |
| A. | All the offsprings will be albinism |
| B. | Half of the offsprings will be albinism |
| C. | 75% offsprings will be albinism |
| D. | No offspring will be albinism |
| Answer» B. Half of the offsprings will be albinism | |
| 7180. |
Phenyketonuria is a genetic disorder of [Kerala CET 2005] |
| A. | Trisomic condition |
| B. | Monosomic condition |
| C. | Autosomal dominant gene |
| D. | Autosomal recessive gene |
| E. | X-linked |
| Answer» E. X-linked | |
| 7181. |
In man the mutation disease 'Aniridia' (Congenital absence of iris) occurs due to |
| A. | Recessive mutation |
| B. | Dominant mutation |
| C. | Lethal mutation |
| D. | All the above |
| Answer» C. Lethal mutation | |
| 7182. |
The cause of Turner's syndrome in man is |
| A. | Incomplete sex linkage |
| B. | Sex-linked inheritance |
| C. | Autosomal abnormality |
| D. | Sex-chromosomal abnormality |
| Answer» E. | |
| 7183. |
Edward syndrome is on account of....... [MP PMT 1994, 99, 2000, 04] |
| A. | 45 chromosomes instead of 46 |
| B. | Presence of three chromosomes on 18th pair of autosome |
| C. | Presence of three chromosomes on 21st pair of autosome |
| D. | Presence of three pair of sex chromosomes |
| Answer» C. Presence of three chromosomes on 21st pair of autosome | |
| 7184. |
Mutations are responsible for |
| A. | Increasing the population rate |
| B. | Variations in organisms |
| C. | Constancy in organisms |
| D. | For beneficial changes in organisms |
| Answer» C. Constancy in organisms | |
| 7185. |
Sometimes chromosome number increase or decrease due to [AFMC 1996] |
| A. | Non-disjunction of chromosome |
| B. | Genetic repete |
| C. | Mutation |
| D. | All of these |
| Answer» B. Genetic repete | |
| 7186. |
Albinism is a congenital disorder resulting from the lack of the enzyme [CBSE PMT 1994] |
| A. | Catalase |
| B. | Fructokinase |
| C. | Tyrosinase |
| D. | Xenthine oxidase |
| Answer» D. Xenthine oxidase | |
| 7187. |
Point mutation is a change which involves [MP PMT 1995] |
| A. | Loss of a gene |
| B. | Addition of a gene |
| C. | Deletion of a segment of a gene |
| D. | Change in a base of a gene |
| Answer» E. | |
| 7188. |
If an albino man marries with a normal woman and 50 offsprings are albino and 50 are normal, the woman is [CPMT 1977; DPMT 1992; MP PMT 1998] |
| A. | Heterozygous normal |
| B. | Homozygous normal |
| C. | Heterozygous carrier |
| D. | None of these |
| Answer» D. None of these | |
| 7189. |
Which of the following is not related to chromosomal aberration [MP PMT 1995] |
| A. | Euploidy |
| B. | AIDS |
| C. | Aneuploidy |
| D. | Klinefelter's syndrome |
| Answer» C. Aneuploidy | |
| 7190. |
The most striking example of point mutation is found in a disease called [CBSE PMT 1995] |
| A. | Night blindness |
| B. | Thalassemia |
| C. | Down's syndrome |
| D. | Sickle-cell anaemia |
| Answer» E. | |
| 7191. |
The functional unit of mutation is [JIPMER 1994; MP PMT 1994; AFMC 1995] |
| A. | Gene |
| B. | Muton |
| C. | Recon |
| D. | Cistron |
| Answer» C. Recon | |
| 7192. |
In Drosophila, gene for white eye mutation is also responsible for depigmentation of body parts. Thus a gene that controls several phenotypes is called [Kerala CET 2005] |
| A. | Oncogene |
| B. | Epistatic gene |
| C. | Hypostatic gene |
| D. | Pleiotropic gene |
| E. | Sex-linked gene |
| Answer» E. Sex-linked gene | |
| 7193. |
Continuous variations are attributed to |
| A. | Chromosomal aberrations |
| B. | Polyploidy |
| C. | Mutations |
| D. | Crossing over |
| Answer» E. | |
| 7194. |
A hereditary disease which is never passed on from father to son is [J&K CET 2005] |
| A. | Autosomal linked disease |
| B. | X-chromosomal linked disease |
| C. | Y-chromosomal linked disease |
| D. | None of these |
| Answer» C. Y-chromosomal linked disease | |
| 7195. |
Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted on [MP PMT 1994] |
| A. | Althea rosea |
| B. | Pisum sativum |
| C. | Drosophila melanogaster |
| D. | Oenothera lamarckiana |
| Answer» E. | |
| 7196. |
An example of a disease of molecular mutation is [MP PMT 1994] |
| A. | Erythroblastosis fetalis |
| B. | Haemophilia |
| C. | Anaemia |
| D. | Sickle-cell anemia |
| Answer» E. | |
| 7197. |
The gene which increases the frequency of mutation in other gene is referred to as |
| A. | Mutator gene |
| B. | Mutagene |
| C. | Hypostatic gene |
| D. | Complementary gene |
| Answer» B. Mutagene | |
| 7198. |
Condition of sex chromosomes in a male child of Down's syndrome will be [CBSE PMT 1991] |
| A. | XY |
| B. | XXY |
| C. | XX |
| D. | XO |
| Answer» B. XXY | |
| 7199. |
What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring [MP PMT 1990] |
| A. | 23 |
| B. | 22 |
| C. | 21 |
| D. | 24 |
| Answer» E. | |
| 7200. |
Symptoms representing a particular disease due to chromosomal abnormalities are referred to |
| A. | Sex mosaic |
| B. | Syndrome |
| C. | Lethal |
| D. | Pedigree |
| Answer» C. Lethal | |