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प्रश्न
A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf (t) plant bearing white (r) flowers :-
(i) Give the genotype and phenotype of the plants of F1 generation.
(ii) Mention the possible combinations of the gametes that can be obtained from the F1 hybrid plant.
(iii) State the Mendel’s law of Independent Assortment.
(iv) Mention the phenotypes of the off springs obtained in F2 generation.
(v) What is the phenotypic ratio obtained in F2 generation?
उत्तर
(i) Genotype of F1 generation plants: TtRr
Phenotype of F1 generation plants: Tall and red-coloured flowers
(ii) Possible combination of gametes obtained by the F1 hybrids:
(iii) In case of two or more contrasting characters, the distribution of each member of one pair of characters in the gametes is independent of the distribution of the other pair.
(iv) Phenotypes of offspring obtained in the F2 generation:
- Tall plants with red flowers
- Tall plants with white flowers
- Dwarf plants with red flowers
- Dwarf plant with white flowers
(v) The phenotypic ratio obtained in the F2 generation is 9:3:3:1.
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संबंधित प्रश्न
Define the following:
Dominant
A typical Mendelian dihybrid ratio of F2 generation is 3:1.
The test cross is used to determine the ______.
Which one from those given below is the period for Mendel's hybridization experiments?
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be ______.
Read the following and answer from given below:
Prashant wanted to find the genotype of a pea plant bearing purple coloured flowers in his kitchen garden. For this, he crossed purple-flowered plants with white-flowered plants. As a result, all plants which were produced had purple flowers only. Upon selfing these plants, 75 purple flower plants and 25 white flowers plants were produced. Now, he can determine the genotype of a purple-flowered plant by crossing it with a white-flowered plant.
To determine the genotype of a purple-flowered plant, Prashant crossed this plant with a white-flowered plant. This cross represents a ______
Mendel was the first biologist to ______
In Mendel's experiments, colour of seed coat, nature of flower, position of flower, colour of pod, height of stem, are called
Give statement of the law of dominance.
Tall pea plants having green pods were crossed with dwarf pea plants having yellow pods. Out of 80 plants, how many are likely to be tall plants in the F2 generation?
