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प्रश्न
List two differences in tabular form between dominant trait and recessive traits. What percentage/proportion of the plants in the F2 generation/progeny were round, in Mendel's cross between round and wrinkled pea plants?
उत्तर
Difference between dominant trait and recessive gene/trait
| Dominant Trait | Recessive Trait |
| It is a trait or characteristic, which is able to express itself over another contrasting trait. | It is a trait which is unable to express its effect in the presence of the dominant trait. |
| It can express in both heterozygous and homozygous conditions. | It can express only in homozygous condition. |
Cross between round (RR) and wrinkled (rr) pea plants
Parents RR ⨉ rr
Gametes R r
F1 progeny Rr (round seed)
Selfing in F2 generation
| R | r | |
| R | RR | Rr |
| r | Rr | rr |
Result: In F2 generation, the progeny will be
75% round (RR, Rr)
25% wrinkled (rr)
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संबंधित प्रश्न
List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants.
Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors?
What type of plants were used by Mendel for conducting his experiments on inheritance?
Fill in the following blank with suitable word .
In pea plants, the gene for dwarfness is ..............whereas that for tallness is ............ .
Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor' State where these factors are found in gametes.
Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive :
Round seed
What are the possible blood groups likely to be inherited by children born to a group A mother and a group B father? Explain your reasoning.
Write advantages of science of heredity.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F1 progeny are tall. When the tall plants of F1 progeny are crossed, short plants re-appear in F2 progeny.
Reason: Traits are independently inherited.
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
