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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
Mutation alerts the hereditary material. Give reasons.
A pure tall plant (TT) is crossed with a pure dwarf plant (tt).
Draw Punnet squares to show
(1) F2 generation
(2) F2 generation.
Explain the Term Heredity.
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:
Most genetic diseases in man are recessive in character.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
A female is responsible for the sex of the progeny.
Multiple Choice Question
When an individual has both the genes of a contrasting character, it is said to be:
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 _______.
What is allelomorph?
In a dihybrid cross with contrasting characters, the number of different genotypes obtained in F2 generation are ______.
Using ______, the production of gametes by the parents, the formation of zygotes, the F1 and F2 plants can be understood.
Identify the genotype of a round seeded tall plant which when crossed with a plant of similar genotype produces the following percentage of phenotypes:
(tall round = 56.25 %, tall wrinkled = 18.75 %, dwarf round = 18.75 %, dwarf wrinkled = 6.25 %.)
A pea plant with the genotype YyRr is crossed with another pea plant with the genotype yyrr. The expected phenotypic ratio of individuals formed will be ______
A normal visioned woman whose father is colourblind married a normal visioned man. What are the probabilities of her sons or daughters to be colourblind? Explain with the help of Punnett square.
Parents of blood group i and AB cannot have a child of blood group AB because ______.
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 |
An indvidual of genotype, Aa Bb Cc Dd is used in test cross. How many different phenotypes can appear in this progeny?
