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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1401. |
In multiple allele system a gamete possesses |
| A. | 2 alleles |
| B. | 3 alleles |
| C. | one allele |
| D. | several alleles |
| E. | cessive |
| Answer» D. several alleles | |
| 1402. |
Zea mays has 10 pairs of chromosomes . Linkage groups present in it are |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 40 |
| E. | cessive |
| Answer» C. 20 | |
| 1403. |
A couple has four daughters. The percentage probability of fifth child to be a Daughter is. |
| A. | 10 |
| B. | 50 |
| C. | 75 |
| D. | 100 |
| E. | cessive |
| Answer» C. 75 | |
| 1404. |
The longer the chromosome of an organism, the more genetic variability it gets from, |
| A. | Independent assortment |
| B. | Linkage |
| C. | Crossing over |
| D. | Mutation. |
| E. | cessive |
| Answer» D. Mutation. | |
| 1405. |
In human being sex chromosomal complement is |
| A. | XX - XY |
| B. | XX - XO |
| C. | ZO - ZZ |
| D. | ZW - ZZ |
| E. | cessive |
| Answer» B. XX - XO | |
| 1406. |
Segregation of genes take place during which phase of cell division ? |
| A. | Metaphase |
| B. | Anaphase |
| C. | prophase |
| D. | Embryo formation |
| E. | cessive |
| Answer» C. prophase | |
| 1407. |
What does the term recombination describe ? |
| A. | Generation of non- parental gene combination |
| B. | Generation of parental gene combination |
| C. | Generation of internal gene combination |
| D. | All of the above |
| E. | cessive |
| Answer» B. Generation of parental gene combination | |
| 1408. |
In Bonellia all larva are genetically and cytologically similar. In this worm mole individuals live inthe uterus of female. If a particular larva settle near proboscis of an adult female, it becomes a male individuals. Larva develops free in water it becomes. |
| A. | Male individuals |
| B. | Female individuals |
| C. | Inter Sex |
| D. | Super female |
| E. | cessive |
| Answer» C. Inter Sex | |
| 1409. |
which statement is incorrect regarding gene mutation |
| A. | Mutations may be gradual or they may not be induced. |
| B. | Mutation is an evolutionary agent |
| C. | Any gene can undergo mutation |
| D. | Mutated gene is harmful to the individual |
| E. | cessive |
| Answer» B. Mutation is an evolutionary agent | |
| 1410. |
In this group of plants male is heterogametic and female is homogametic type |
| A. | Gymnosperms |
| B. | Bryophytes |
| C. | pteridophytes |
| D. | angiosperms |
| E. | cessive |
| Answer» E. cessive | |
| 1411. |
In T. H. Morgan"s Experiment on Drosophilia what will be the result when F1 female flies are crossed with double recessive male files ? |
| A. | 83% parental combinations 17% Recombinations |
| B. | 41.5 % parental combinations 58.5% recombinations |
| C. | 60% parental combinations 40 % recombinations |
| D. | 90 % parental combinations 10% Recombinations |
| E. | cessive |
| Answer» B. 41.5 % parental combinations 58.5% recombinations | |
| 1412. |
Which is very common method to study Human Karyotype ? |
| A. | Blood culture method |
| B. | Tissue culture method |
| C. | Pedigree method |
| D. | Statistical method |
| E. | cessive |
| Answer» B. Tissue culture method | |
| 1413. |
What is called Free martin ? |
| A. | Sterile male born along with a fertile female |
| B. | Sterile intersex born along with a fertile female |
| C. | Sterile super male born along with a intersex |
| D. | Sterile female born along with a fertile male |
| E. | cessive |
| Answer» E. cessive | |
| 1414. |
Meiosis produce 4 daughter cells but each daughter cell differ from one another because of |
| A. | Crossing over |
| B. | Independent assortment |
| C. | Change in chromosome number |
| D. | Both A & B |
| E. | cessive |
| Answer» E. cessive | |
| 1415. |
This is reversal of mutation |
| A. | Spontneous mutation |
| B. | Zygotic mutation |
| C. | Back mutation |
| D. | Recessive mutation |
| E. | cessive |
| Answer» D. Recessive mutation | |
| 1416. |
What is incorrect statement Gynandromorphs ? |
| A. | Individuals who show male characters and female characters |
| B. | Individuals who show only female characters |
| C. | It happens due to less of X- chromosomes |
| D. | It happens due to binacleated eggs |
| E. | cessive |
| Answer» C. It happens due to less of X- chromosomes | |
| 1417. |
) In humans , height shows a lot of variation . It is an example of |
| A. | Multiple alleles |
| B. | Pleiotropic inheritance |
| C. | polygenic inheritance |
| D. | False allelic inheritance |
| E. | cessive |
| Answer» D. False allelic inheritance | |
| 1418. |
When there is no Possibility of independent assortment of genes during gametogenesis then What Will be the real ratio of F2 in dihybrd cross? |
| A. | 9 : 3 : 3 : 1 |
| B. | 11 : 1 : 1 : 3 |
| C. | 12 : 1 : 1 : 2 |
| D. | 9 : 3 : 2 : 2 |
| E. | cessive |
| Answer» C. 12 : 1 : 1 : 2 | |
| 1419. |
State the cause of Philadelphia syndrome |
| A. | Deletion from the long arm of chromosome number 20 |
| B. | Duplication in long arm of chromosome number 20 |
| C. | Deletion from the long arm of chromosome number 22 |
| D. | Deletion from the short arm of chromosome number 22 |
| E. | cessive |
| Answer» D. Deletion from the short arm of chromosome number 22 | |
| 1420. |
Name the Plant possessing two X chromosomes |
| A. | Humulus japanic |
| B. | Dioscoria sinulate |
| C. | Flagellaria |
| D. | Both (A) & (B) |
| E. | cessive |
| Answer» E. cessive | |
| 1421. |
Checkerboard method of calculations was developed by |
| A. | Mendel |
| B. | Bateson |
| C. | punnett |
| D. | Morgan |
| E. | cessive |
| Answer» B. Bateson | |
| 1422. |
By which gene sex is determind in Spinach ? |
| A. | Single gene "m" located in the X- chromosome |
| B. | Single gene "m" located in the Y- chromosome |
| C. | Single gene "t" located in the X- chromosome |
| D. | Single gene "t" located in the Y- chromosome |
| E. | cessive |
| Answer» B. Single gene "m" located in the Y- chromosome | |
| 1423. |
What is Barr body ? |
| A. | One more than the number of X - chromosomes |
| B. | One more than the number of Y-chromosomes |
| C. | One less than the number of X - chromosomes |
| D. | Two less than the number of X - chromosomes |
| E. | cessive |
| Answer» D. Two less than the number of X - chromosomes | |
| 1424. |
) First generation after a cross is |
| A. | First filial generation |
| B. | F1 gneratioon |
| C. | Second filial generation |
| D. | Both (A) and (B) |
| E. | cessive |
| Answer» E. cessive | |
| 1425. |
Name the enzyme needed for the following biochemical reaction Tyrosine enzyme Melanin |
| A. | Melanase |
| B. | tyrosinase |
| C. | Tyrosine aminase |
| D. | transaminase |
| E. | cessive |
| Answer» D. transaminase | |
| 1426. |
Which factor in nature causes discontinuous Variation in a population ? |
| A. | Recombination |
| B. | Shufflng of parental genes |
| C. | Mutation |
| D. | Geneflow |
| E. | cessive |
| Answer» D. Geneflow | |
| 1427. |
Which condition among the following is lethal ? |
| A. | (2n-2) |
| B. | (2n +2) |
| C. | (2n +1) |
| D. | (2n- 1) |
| E. | cessive |
| Answer» B. (2n +2) | |
| 1428. |
which cross yielded a ratio of 7:1 :1:7 ? |
| A. | Test cross (Dihybrid) - Bateson and punnet |
| B. | Test cross (Monohybrid) - Bateson and punnet |
| C. | Test cross (Dihybri |
| D. | - Carrel correns |
| E. | cessive |
| Answer» D. - Carrel correns | |
| 1429. |
Name the disorder caused by trisomy of sex chromosomes. |
| A. | Down’s syndrome |
| B. | Kline felter’s syndrome |
| C. | Turner’s syndrome |
| D. | Edward’s syndrome |
| E. | cessive |
| Answer» C. Turner’s syndrome | |
| 1430. |
Punnet square is used to know |
| A. | outcome of a cross |
| B. | probable result of a cross |
| C. | Types of gametes |
| D. | Number of gametes |
| E. | cessive |
| Answer» C. Types of gametes | |
| 1431. |
What happens to excessive phenylalanine accumulation in the blood of phenylketonuria patient ? |
| A. | Get deposited on synovial membrane |
| B. | excreted in urine |
| C. | Get deposited in storage organs |
| D. | All of the above |
| E. | cessive |
| Answer» C. Get deposited in storage organs | |
| 1432. |
A normal woman, whose father was colour blind is married with normal man. The sons would be AIPMT - 2004 |
| A. | 75% Colour blind |
| B. | 50% colour blind |
| C. | all normal |
| D. | all colourblind |
| E. | cessive |
| Answer» B. 50% colour blind | |
| 1433. |
Which one of the following traits of garden pea studied by Mendel was a recessive feature? AIPMT - 2003 |
| A. | Axial flower position |
| B. | Green Seed colour |
| C. | Green pod colour |
| D. | Round Seed shape |
| E. | cessive |
| Answer» C. Green pod colour | |
| 1434. |
Which kind of structural abnormality is seen in the above chromosome? |
| A. | Terminal deletion |
| B. | Duplication (Tandem) |
| C. | Duplication (Reverse) |
| D. | Inversion |
| E. | cessive |
| Answer» C. Duplication (Reverse) | |
| 1435. |
What kind of sex determination is seen in the given chart? |
| A. | Sex determination in drosophila |
| B. | Sex determination in honey bee |
| C. | Sex determination in moth |
| D. | Sex determination in butterfly |
| E. | cessive |
| Answer» C. Sex determination in moth | |
| 1436. |
What does the diagram represent ? |
| A. | synapsis Zygotene |
| B. | crossing over, Diplotene |
| C. | Tetrad, Pachytene |
| D. | Terminalization, Diakinesis |
| E. | cessive |
| Answer» C. Tetrad, Pachytene | |
| 1437. |
Name the abnormality seen in chromosome number - 2 |
| A. | Interstitial Deletion |
| B. | Terminal Deletion |
| C. | Tandem Duplication |
| D. | Reverse Duplicaton |
| E. | cessive |
| Answer» B. Terminal Deletion | |
| 1438. |
.The recessive genes located on X - chromosome of humans are alwaysAIPMT-2004 |
| A. | Lethal |
| B. | Sub - Lethal |
| C. | expressed in males |
| D. | expressed in females |
| E. | cessive |
| Answer» D. expressed in females | |
| 1439. |
Which law of Mendel can be explained on chromosomal basis of inheritance ? |
| A. | Law of dominance |
| B. | Law of segregation |
| C. | Law of independent assortment |
| D. | All the above |
| E. | cessive |
| Answer» D. All the above | |
| 1440. |
What do A, B, C represent in the given diagram? |
| A. | Centromere, chromatids chiasma |
| B. | Chromatid, chiasma, centromere |
| C. | Centromere, chiasma, chromatid |
| D. | Chromatid, chiasma centromere |
| E. | cessive |
| Answer» B. Chromatid, chiasma, centromere | |
| 1441. |
Out of the marked portions X, Y and Z, in which region the male worm develop ? |
| A. | X |
| B. | Y |
| C. | Z |
| D. | All the three regions |
| E. | cessive |
| Answer» D. All the three regions | |
| 1442. |
Match the following_ans_key_Column I Column II_ans_key_1. Single gene inheritance a. 1 : 1: 1 : 1_ans_key_2. Double gene inheritance b. 1 : 2 : 1_ans_key_3. Test cross c. 3 : 1_ans_key_4. Incomplete dominance d. 9 : 3 : 3 : 1 |
| A. | (1 - c) (2 - d) (3 - a) (4 - b) |
| B. | (1 - d) (2 - c) (3 - b) (4 - a) |
| C. | (1 - a) (2 - b) (3 - |
| D. | (4 - c) |
| E. | cessive |
| Answer» B. (1 - d) (2 - c) (3 - b) (4 - a) | |
| 1443. |
The genes Controlling the seven characters of a pea plant studied by Mendel are now known to be located on how many different chromosomes? AIPMT - 2003 |
| A. | Seven |
| B. | Six |
| C. | Five |
| D. | Four |
| E. | cessive |
| Answer» E. cessive | |
| 1444. |
Match the following_ans_key_Column I Column II_ans_key_1. Johansen a. Coined the term gene_ans_key_2. Mendel b. Crossing over in drosophila_ans_key_3. T. H. Morgan c. Linkage in lathyrus odoratus_ans_key_4. Bateson & punnett d. Law of segregation |
| A. | (1 - d) (2 - c) (3 - |
| B. | (4 - a) (B) (1 - a) (2 - d) (3 - b) (4 - c) |
| C. | (1 - c) (2 - |
| D. | (3 - b) (4 - a) (D) (1 - b) (2 - d) (3 - a) (4 - c) |
| E. | cessive |
| Answer» C. (1 - c) (2 - | |
| 1445. |
The value of X/A is given in column A and sex of the fly is written in column B._ans_key_Match the following :-_ans_key_Column I Column II_ans_key_1. 1 ( |
| A. | Normal Male_ans_key_2. 1.5 |
| B. | super male Sterile_ans_key_3. 0.67 |
| C. | inter sex_ans_key_4. 0.33 |
| D. | super Female sterile_ans_key_5. 0.5 (e) Normal Female |
| E. | cessive |
| Answer» C. inter sex_ans_key_4. 0.33 | |
| 1446. |
Lack of independent assortment of two genes A and B in fruitfly the Drosophilia is due to |
| A. | Repulsion |
| B. | Recombination |
| C. | Linkage |
| D. | Crossing over |
| E. | cessive |
| Answer» D. Crossing over | |
| 1447. |
Match the following_ans_key_Column I Column II_ans_key_1. Co- dominance a. More then two optional forms of a gene_ans_key_2. Polygenic inheritance b. Multiple effect of a single gene_ans_key_3. Multiple alleles c. Quantitative inheritance_ans_key_4. Pleiotropism d. Both gene express their expression independently |
| A. | (1 - d) (2 - c) (3 - a) (4 - b) |
| B. | (1 - a) (2 - |
| C. | (3 - b) (4 - |
| D. | cessive |
| Answer» B. (1 - a) (2 - | |
| 1448. |
What does the following pedigree chart represent ? |
| A. | Pedigree of sex - influenced disorder |
| B. | Pedigree of sex - linked disorder |
| C. | Pedigree of polydactylous in man |
| D. | Pedigree of gene mutation |
| E. | cessive |
| Answer» D. Pedigree of gene mutation | |
| 1449. |
What does the above cross represent ? |
| A. | Incomplete linkage |
| B. | Complete linkage |
| C. | Crossing over |
| D. | Evolution |
| E. | cessive |
| Answer» C. Crossing over | |
| 1450. |
Whose karyotype is represented below ? |
| A. | Female Drosophila |
| B. | Male Drosophila |
| C. | Intersex Fly |
| D. | Super female fly |
| E. | cessive |
| Answer» C. Intersex Fly | |