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प्रश्न
Differentiate between genotype and phenotype.
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उत्तर
| Genotype | Phenotype | |
| 1. | It designates the genetic constitution of an individual, which determines the characters. Individuals of the same genotype interbreed and have the same phenotype if they are present in the same environment. | It designates the external appearance of an individual. Individuals of the same phenotype may appear alike but may not interbreed if genetically different. |
| 2. | Genotypes cannot be seen but can be found out by modern techniques like DNA fingerprinting. | Phenotypes can be observed directly in an individual. |
| 3. | Individuals possessing the same genotype usually have the same phenotypic expression. | Individuals who look alike, i.e., have the same phenotype, may or may not have the same genotype. |
| 4. | The genotypic ratio obtained in the F2 generation of a monohybrid cross is 1 : 2 : 1. | In the F2 generation of a monohybrid cross, the phenotypic ratio is 3 : 1. |
संबंधित प्रश्न
A cross used to verify the unknown genotype of the F1 hybrid is a ______.
A pure tall plant (TT) is crossed with a pure dwarf plant (tt).
Draw Punnet squares to show
(1) F2 generation
(2) F2 generation.
Give the Phenotypic and Genotypic ratio of the F2 and F2 generation.
Explain the Term Dominance.
Name the following:
The genetic composition of an organism.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Genes are responsible for genetic characters.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Mutation can be brought about artificially.
Write the functional activity of the following structure:
Autosomes
Multiple Choice Question
Genetics is a branch of biology dealing with:
Multiple Choice Question
A cross was made between tall and dwarf plants. In F1 generation all plants were tall, when the F1 plants were selfed, the tall and dwarf plants appeared in a 3 : 1 ratio in the F2 generation. This phenomenon is known as:
Multiple choice question.
When F2 phenotypic and genotypic ratios are the same, then it is an example of _______.
Which one of the following is back cross?
The word chromosome was coined by
A recessive factor is altered by the presence of a dominant factor.
Match the items given in Column I with those listed in Column II. Choose the answer with correct combination of alphabets of the two columns.
| Column I | Column II |
| A. Monohybrid cross | 1. T and t |
| B. Test cross | 2. TT |
| C. Alleles | 3. TT × tt |
| D. Homozygous tall | 4. tt |
| 5. Tt × tt |
A typical dihybrid cross is carried outbetween true breeding plant with yellowround seeds and a true breeding plant withgreen wrinkled seeds. With appropriatesymbol write the genotypes of —
- Homozygous dominant and recessive parents.
- Gametes produced by both the parents.
- Gametes produced by the F, hybrid. (3)
In which region of chromosomes does crossing over take place?
Rewrite the correct form of the statement by changing the first or last word only:
The full complement of DNA of an organism is termed as genetics.
