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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?
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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
In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant in the first generation, F1, only tall plants appear.
(a) What happens to the traits of the dwarf plants in this case?
(b) When the F1-generation plants were self-fertilised, he observed that in the plants of the second generation, F2, both tall plants and dwarf plants were present. Why it happened? Explain briefly.
Mendel crossed tall pea plants with dwarf pea plants in his experiment. Write his observations giving reason on the F1 and F2 generations.
Mendel in one of his experiments with pea plants crossed a variety having round seed with one having wrinkled seeds. Write his observations, giving reasons, of F1 and F2 progeny
With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?
What is the genotype of dwarf plants which always produced dwarf offspring?
When two parents are crossed, the offspring are referred to as :
recessives
test cross
F1 generation
F2 generation
In order to ensure that he had pure-breeding plants for his experiments, Mendel :
(a) cross-fertilised each variety with each other
(b) let each variety self fertilise for several generations
(c) removed the female parts of the plants
(d) removed the male parts of the plants.
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.
Define Heredity. Give two examples.
Why are the traits acquired during the life time of an individual not inherited? Explain.
