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ICSE Class 10 Answered

(i) State Mendel’s law of independent assortment. (ii) A homozygous tall plant (T) bearing red (R) flowers is crossed with a homozygous dwarf plant (t) bearing white flowers (r): Give the genotype and phenotype of the F1 generation. Give the possible combinations of the gametes which can be obtained from the F1 hybrid. Give the dihybrid ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation above are crossed.
Asked by Topperlearning User | 20 Jul, 2015, 02:26: PM
answered-by-expert Expert Answer

(i) Mendel’s law of independent assortment:

In a dihybrid cross, the distribution of the members of one pair into the gametes is independent of the distribution of the other pair.

(ii)  

1. Genotype of F1 generation: Heterozygous tall plants with red flowers (TtRr) 

    Phenotype: Tall plants with red flowers

2. Gametes from F1 hybrid – TR, Tr, tR, tr

3. Dihybrid ratio = 9:3:3:1.

    Tall plant bearing red flowers = 9

    Tall plant bearing white flowers = 3

    Dwarf plant bearing red flowers = 3

    Dwarf plant bearing white flowers = 1

Answered by | 20 Jul, 2015, 04:26: PM

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