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A Homozygous Tall Plant (T) Bearing Red Coloured (R) Flowers is Crossed with a Homozygous Dwarf (T) Plant Bearing White (R) Flowers - ICSE Class 10 - Biology

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Question

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?

Solution

(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:

  1. Tall plants with red flowers
  2. Tall plants with white flowers
  3. Dwarf plants with red flowers
  4. Dwarf plant with white flowers

(v) The phenotypic ratio obtained in the F2 generation is 9:3:3:1.

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APPEARS IN

 2015-2016 (March) (with solutions)
Question 7.1 | 5.00 marks
Solution A Homozygous Tall Plant (T) Bearing Red Coloured (R) Flowers is Crossed with a Homozygous Dwarf (T) Plant Bearing White (R) Flowers Concept: Genetics: Mendel’s Laws of Inheritance.
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