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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.
| 6601. |
Grain colour in wheat is determined by three pairs if polygenes. Following the cross AABBCC (dark colour) × aabbcc (light colour), in \[{{F}_{2}}\] generation what proportion of the progeny likely to resemble either parent [AIIMS 2005] |
| A. | None |
| B. | Less than 5 per cent |
| C. | One third |
| D. | Half |
| Answer» C. One third | |
| 6602. |
Lathyrus odoratus is an example of which of the following genes [CPMT 2000] |
| A. | Supplementary genes |
| B. | Complementary genes |
| C. | Lethal genes |
| D. | Codominant genes |
| Answer» C. Lethal genes | |
| 6603. |
The hybrid produced by cytoplasmic fusion is called |
| A. | A sexual hybrid |
| B. | Parasexual hybrid |
| C. | Somatic hybrid |
| D. | Protoplastic hybrid |
| Answer» D. Protoplastic hybrid | |
| 6604. |
The phenotypic ratio obtained in quantitative inheritance of a dihybrid cross is [DPMT 2004] |
| A. | 0.0430671296296296 |
| B. | 1 : 4 : 6 : 4 : 1 |
| C. | 1 : 6 : 15 20 : 15 : 6 : 1 |
| D. | 9 : 3 : 3 : 1 |
| Answer» C. 1 : 6 : 15 20 : 15 : 6 : 1 | |
| 6605. |
A cross involving two different genera is called |
| A. | Monohybrid cross |
| B. | Interspecific cross |
| C. | Intergeneric cross |
| D. | None of the above |
| Answer» D. None of the above | |
| 6606. |
It is easier to study polygenic inheritance of characters in plants than in animals because in the plants |
| A. | Matings can be controlled and large number of offsprings are obtained |
| B. | Matings cannot be controlled and large number of offsprings are produced |
| C. | Matings can be controlled and a small number of offsprings are produced |
| D. | Matings cannot be controlled and a small number of offsprings are produced |
| Answer» B. Matings cannot be controlled and large number of offsprings are produced | |
| 6607. |
In poultry, new comb colour appears by colaboration of two dominant gene is |
| A. | Walnut |
| B. | Single |
| C. | Rose |
| D. | Pea |
| Answer» B. Single | |
| 6608. |
Which of the following is associated with multiple phenotypes [CPMT 1999;AIIMS 2000; JIPMER 2001; AFMC 2001] |
| A. | Epistasis |
| B. | Pleiotropy |
| C. | Polygenic inheritance |
| D. | Mutation |
| Answer» C. Polygenic inheritance | |
| 6609. |
Episome is a |
| A. | Plasmid |
| B. | Part of a chromosome |
| C. | Lysosome |
| D. | Ribosome |
| Answer» B. Part of a chromosome | |
| 6610. |
Genes which confer antibiotic resistance on bacteria are located on [MP PMT 1995] |
| A. | Chromosomal DNA |
| B. | Plasmid |
| C. | RNA |
| D. | Polysome |
| Answer» C. RNA | |
| 6611. |
Plasmids are composed of |
| A. | Folded RNA molecules |
| B. | Single stranded DNA |
| C. | Circular double stranded DNA |
| D. | None of the above |
| Answer» D. None of the above | |
| 6612. |
Plasmids so found in bacteria are [MP PMT 2003] |
| A. | Extra nuclear DNA |
| B. | Food particles |
| C. | Dead protoplasmic parts |
| D. | None of the above |
| Answer» B. Food particles | |
| 6613. |
Now a days which of the following are known as "magic circles" |
| A. | Plasmids |
| B. | Genes |
| C. | Amyloplasts |
| D. | Elaioplasts |
| Answer» B. Genes | |
| 6614. |
Hereditary element may be attached to chromosome or found free in cytoplasm is called |
| A. | Microsome |
| B. | Diosome |
| C. | Peroxisome |
| D. | Episome |
| Answer» E. | |
| 6615. |
Genes for cytoplasmic male sterility in plants are generally located in [CBSE PMT 2005] |
| A. | Mitochondrial genome |
| B. | Cytosol |
| C. | Chloroplast genome |
| D. | Nuclear genome |
| Answer» B. Cytosol | |
| 6616. |
Extranuclear inheritance is a consequence of presence of genes in [CBSE PMT 2004] |
| A. | Ribosomes and chloroplasts |
| B. | Lysosomes and ribosomes |
| C. | Mitochondria and chloroplasts |
| D. | Endoplasmic reticulum and mitochondria |
| Answer» D. Endoplasmic reticulum and mitochondria | |
| 6617. |
What is the other name for "incomplete dominance'' |
| A. | Blending inheritance |
| B. | Co-dominance |
| C. | Pseudo-dominance |
| D. | All the above |
| Answer» B. Co-dominance | |
| 6618. |
Incomplete dominance is shown by [MHCET 2004] |
| A. | Primrose |
| B. | Mirabilis |
| C. | Helianthus |
| D. | China rose |
| Answer» C. Helianthus | |
| 6619. |
\[{{F}_{1}}\] hybrid is intermediate between the two parents. The phenomenon is [MHCET 2004] |
| A. | Codominance |
| B. | Dominace |
| C. | Blending inheritance |
| D. | Incomplete dominance |
| Answer» E. | |
| 6620. |
After crossing two plants, the progenies are found to be male sterile. The phenomenon is found to be maternally inherited and is due to some genes which reside in [CBSE PMT 1997; Pb. PMT 2000] |
| A. | Nucleus |
| B. | Chloroplast |
| C. | Mitochondria |
| D. | Cytoplasm |
| Answer» E. | |
| 6621. |
The two organelles responsible for cytoplasmic inheritance among eukaryotes are [MP PMT 1993] |
| A. | Lysosomes and mitochondria |
| B. | Mitochondria and golgi complex |
| C. | Chloroplasts and mitochondria |
| D. | Chloroplasts and lysosomes |
| Answer» D. Chloroplasts and lysosomes | |
| 6622. |
Mirabilis jalapa is a good example of [AIIMS 2001] |
| A. | Complete dominance |
| B. | Plastid inheritance |
| C. | Both (a) and (b)s |
| D. | None of the above |
| Answer» C. Both (a) and (b)s | |
| 6623. |
When an albino female plant of maizeis crossed with normal green male plant, all plants in the progeny are albino because [CBSE PMT 1989; CMC Vellore 1994] |
| A. | Plastids are inherited through maternal plants |
| B. | Albinism is dominant over green character |
| C. | The crossing results in structural changes in green plastids |
| D. | Green plastids of male parents become mutated |
| Answer» B. Albinism is dominant over green character | |
| 6624. |
Kappa particles indicate [MP PMT 1987, 2003] |
| A. | Nuclear inheritance |
| B. | Cytoplasmic inheritance |
| C. | Mutation |
| D. | Nucleo-cytoplasmic inheritance |
| Answer» C. Mutation | |
| 6625. |
Complete dominance is absent in [JIPMER 2002] |
| A. | Pisum sativum |
| B. | Mirabilis jalapa |
| C. | Lathyrus odoratus |
| D. | Oenothera lamarckiana |
| Answer» C. Lathyrus odoratus | |
| 6626. |
The phenomenon of incomplete dominance was observed by |
| A. | De Vries |
| B. | Correns |
| C. | Tschermak |
| D. | None of the above |
| Answer» C. Tschermak | |
| 6627. |
What would be the colour of flowers in \[{{F}_{1}}\] progeny as a result of a cross between homozygous red and homozygous white-flowered Snapdragon [MP PMT 1997] |
| A. | Red |
| B. | White |
| C. | Red and white |
| D. | Pink |
| Answer» E. | |
| 6628. |
9 : 3 : 3 : 1 ratio is modified to 9 : 7 ratio due to [CPMT 1998; CBSE PMT 2001] |
| A. | Complementry gene |
| B. | Epistatic gene |
| C. | Hypostatic gene |
| D. | Supplementry gene |
| Answer» B. Epistatic gene | |
| 6629. |
In Mirabilis jalapa, when homozygous red-flowered and white-flowered plants are crossed, all \[{{F}_{1}}\] plants have pink-coloured flowers. In \[{{F}_{2}}\] produced by selfing of \[{{F}_{1}}\] individuals, red, pink and white flowered plants appear respectively in the ratio of or What will be the ratio in \[{{F}_{2}}\] generation if red-flowered variety of Mirabilis jalapa is crossed with white-flowered variety [MP PMT 1995, 98, 99; BHU 2003] |
| A. | 1 : 1 : 1 : 1 |
| B. | 0.0430671296296296 |
| C. | 0.0840277777777778 |
| D. | 0.125694444444444 |
| Answer» C. 0.0840277777777778 | |
| 6630. |
The phenomenon in which an allele of one gene suppresses the activity of an allele of another gene is known as [CBSE PMT 1995] |
| A. | Dominance |
| B. | Inactivation |
| C. | Epistasis |
| D. | Suppression |
| Answer» D. Suppression | |
| 6631. |
Genes that are similar in phenotypic effect when present separately, but together interact to produce a different trait and ratio is 9 : 7 in \[{{F}_{2}}\] generation. What are such genes known as [DPMT 1980] |
| A. | Supplementary genes |
| B. | Complementary genes |
| C. | Hypostatic genes |
| D. | Epistatic genes |
| Answer» D. Epistatic genes | |
| 6632. |
In shorthorn cattle genes for red \[({{r}_{1}}),\] and white \[({{r}_{2}})\] coat colour occur. Crosses between red \[({{r}_{1}}{{r}_{2}})\] and white \[({{r}_{2}}{{r}_{2}})\] produced \[({{r}_{1}}{{r}_{2}})\] roan. This is an example of [BHU 2003] |
| A. | Complementary genes |
| B. | Epistasis |
| C. | Codominance |
| D. | Incomplete dominance |
| Answer» D. Incomplete dominance | |
| 6633. |
The fruit shape in tomato is an example of |
| A. | Complementary gene |
| B. | Supplementary genes |
| C. | Polygenic inheritance |
| D. | Duplicate genes |
| Answer» E. | |
| 6634. |
Lethal genes are |
| A. | Dominant homozygous |
| B. | Recessive |
| C. | Dominant heterozygous |
| D. | Codominant |
| Answer» B. Recessive | |
| 6635. |
Which is the example of inhibitory gene |
| A. | Rice |
| B. | Pea |
| C. | Sweet pea |
| D. | All the above |
| Answer» B. Pea | |
| 6636. |
In \[{{F}_{2}}\] generation of monohybrid cross the cause of 1 : 2 : 1 phenotypic ratio is [Pb. PMT 2004] |
| A. | Epistatics |
| B. | Inhibition |
| C. | Quantitative inheritance |
| D. | Incomplete dominance |
| Answer» D. Incomplete dominance | |
| 6637. |
The \[{{F}_{2}}\] dihybirid ratio 9 : 3 : 4 is explained on the basis of [BHU 1988] |
| A. | Epistatic gene |
| B. | Supplementary gene |
| C. | Allelic interaction |
| D. | Complementary gene interaction |
| Answer» C. Allelic interaction | |
| 6638. |
Amentum (Catkin) inflorescence is found [JIPMER 1996] |
| A. | Mulberry (Morus) |
| B. | Poplulus (Poplar) |
| C. | Acalypha (Cats tail) |
| D. | All of these |
| Answer» E. | |
| 6639. |
A racemose inflorescence with sessile acropetal flowers is called |
| A. | Spike |
| B. | Corymb |
| C. | Umbel |
| D. | Raceme |
| Answer» B. Corymb | |
| 6640. |
The flowers in the raceme/racemose are arranged [Pb. PMT 2000] |
| A. | Acropetally |
| B. | Basipetally |
| C. | Centripetally |
| D. | Centrifugally |
| Answer» B. Basipetally | |
| 6641. |
The most advanced type of inflorescence is |
| A. | Corymb |
| B. | Catkin |
| C. | Spadix |
| D. | Capitulum |
| Answer» E. | |
| 6642. |
Which is the same type of inflorescence |
| A. | Raceme and Cyathuim |
| B. | Corymb and Umbel |
| C. | Hypanthodium and Catkin |
| D. | Verticillaster and Spike |
| Answer» C. Hypanthodium and Catkin | |
| 6643. |
Opening of flowers in the cymose inflorescence is [AMU 1989] |
| A. | Acropetal |
| B. | Centrifugal |
| C. | Basipetal |
| D. | Centripetal |
| Answer» C. Basipetal | |
| 6644. |
The most important function of inflorescence is to help in |
| A. | Forming large number of fruits |
| B. | Attracting insects for cross pollination |
| C. | Dispersal of seeds |
| D. | Release of pollen grains |
| Answer» C. Dispersal of seeds | |
| 6645. |
Hypanthodium is a specialized type of [BVP 2002] |
| A. | Thalamus |
| B. | Ovary |
| C. | Fruit |
| D. | Inflorescence |
| Answer» E. | |
| 6646. |
In China rose, the inflorescence is [MHCET 2004] |
| A. | Cymose |
| B. | Capitulum |
| C. | Racemose |
| D. | Solitary cyme |
| Answer» E. | |
| 6647. |
Cyathium is a type of [MHCET 2000] |
| A. | Fruit |
| B. | Fungus |
| C. | Alga |
| D. | Inflorescence |
| Answer» E. | |
| 6648. |
The inflorescence found in Ficus is known as [Pb. PMT 2004] |
| A. | Cyathium |
| B. | Catkin |
| C. | Syconus |
| D. | Hypanthodium |
| Answer» E. | |
| 6649. |
The edible part of cauliflower is: [CPMT 2004; AFMC 2005] |
| A. | Mesocarp |
| B. | Cotyledons |
| C. | Endosperms |
| D. | Inflorescence |
| Answer» E. | |
| 6650. |
The capitulum type of inflorescence is found in [J & K CET 2005] |
| A. | Marigold |
| B. | Salvia |
| C. | Euphorbia |
| D. | Jasmine |
| Answer» B. Salvia | |