A pure tall plant (TT) is crossed with pure dwarf plant (tt), what would be the F 1 and F 2 generations? Explain.

In F1 Generation, all the plants will be tall when they crossed the pure tall plant (TT) is crossed with the pure dwarf plant (tt). In F2 Generation, by self crossing the F1 hybrid, both tall and dwarf plants are obtained. In F2 Generation, the phenotypic ratio will be 3: 1(TT: Tt: Tt: tt), and the genotypic ratio will be 1: 2: 1(TT: Tt: tt).

A pure tall plant (TT) is crossed with pure dwarf plant (tt), what would be the F 1 and F 2 generations? Explain.

In F1 Generation, all the plants will be tall when they crossed the pure tall plant (TT) is crossed with the pure dwarf plant (tt). In F2 Generation, by self crossing the F1 hybrid, both tall and dwarf plants are obtained. In F2 Generation, the phenotypic ratio will be 3: 1(TT: Tt: Tt: tt), and the genotypic ratio will be 1: 2: 1(TT: Tt: tt).

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F 1 generation are then cross-bred to produce F 2 generation of pea plants. What do the plants of F 1 generation look like?

Condition I: The cross between the pure-bred tall plants and pure-bred dwarf plants is as follows: The above cross shows that all the hybrid in F 1 generation will be tall. Genotypically, it can be concluded that the plants of F 1 generation will be heterozygous dominant as in the cross between the plants of F 2 generation, the dwarf plant also appears in the small ratio compare to the tall plant.

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F 1 generation are then cross-bred to produce F 2 generation of pea plants. What is the ratio of tall plants to dwarf plants in F 2 generation?

The phenotypic ratio of tall and dwarf plants in F 2 generation is 3:1 and the genotype ratio 1:2:1. Note: Condition I: The cross between the pure-bred tall plants and pure-bred dwarf plants is as follows: The above cross shows that all the hybrid in F 1 generation will be tall. Condition: II The cross between the plants of F 1 generation is as follows: The above cross shows that the recessive character appears in the F 2 generation. It shows the phenotype ratio of 3:1 and the genotype ratio 1:2:1. On the basis of the second cross between the hybrid, Mendel concluded that the recessive trait does not lose its identity.

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 6

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A pure tall plant (TT) is crossed with pure dwarf plant (tt), what would be the F₁ and F₂ generations? Explain.

Important Questions on Genetics

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 7

Explain the structure of a chromosome.

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 8

Label the parts of the DNA in the diagram given below. Explain the structure briefly.

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 1

Explain with an example the inheritance of dihybrid cross. How is it different from monohybrid cross?

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 2

How is the structure of DNA organised? What is the biological significance of DNA?

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 3

The sex of the newborn child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 1

Flowers of the garden pea are bisexual and self-pollinated. Therefore, it is difficult to perform hybridisation experiment by crossing a particular pistil with the specific pollen grains. How Mendel made it possible in his monohybrid and dihybrid crosses?

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 2

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F₁ generation are then cross-bred to produce F₂generation of pea plants.

What do the plants of F₁ generation look like?

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Science Standard 10>Chapter 18 - Genetics>TEXTBOOK EVALUATION>Q 2

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F₁ generation are then cross-bred to produce F₂generation of pea plants.

What is the ratio of tall plants to dwarf plants in F₂ generation?