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प्रश्न
If we pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F1 generation. If we now self-cross the pea plant of F1 generation, then we obtain pea plants of F2 generation.
(a) What do the plants of F2 generation look like?
(b) State the ratio of tall plants to dwarf plants in F2 generation.
(c) State the type of plants not found in F1 generation but appeared in F2 generation, mentioning the reason for the same.
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उत्तर
When a pure breeding tall pea plant is crossed with a pure breeding dwarf pea plant
(a) All the plants in the F1 generation appear tall.
(b) The ratio of tall pea plant to dwarf pea plants is 3 (tall) : 1 (dwarf).
(c) The dwarf plant does not appear in the F1 generation but appears in the F2 generation because the progeny produced in the F1generation were heterozygous (Tt). Hence, when they were selfed for obtaining the F2 generation, dwarf plants were also formed in the progeny. The cross involved in as follows
संबंधित प्रश्न
Mendel crossed tall pea plants with dwarf pea plants in his experiment. Write his observations giving reason on the F1 and F2 generations.
What will you get in the F1 and F2 generations in the following cross?
Pure tall pea plant × Pure dwarf pea plant
Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive :
Round seed
A trait in an organism is influenced by ______
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.
Pure-bred round-yellow pea seeds have genotype RRYY and the pure-bred wrinkled-green pea seeds have genotype rryy. Keeping this in mind, write the phenotypes of the following genotypes of hybrid pea seeds :
(a) Rryy
(b) rrYy
(c) rrYY
(d) RrYy
(e) RRyy
The farmers have been cultivating a food plant X for over two thousand years and have produced as many as five entirely different looking vegetables A, B, C, D and E from it.
(a) What could the plant X be?
(b) What are A, B, C, D and E?
(c) What is the process of evolution involved in this example known as?
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?
Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel’s observations giving reasons of F1 and F2 progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments.
What will be the number of chromosomes present in each gamete produced by the plants if the palisade cells of a species of the plant contain 28 chromosomes in all?
