MENDEL'S MONOHYBRID CROSS 09 HEREDITY AND EVOLUTION Class 10th Biology (Practice Sheet) 1 What is a monohybrid cross? A. Cross between two individuals with similar phenotypes B. Cross between two individuals with heterozygous genotypes C. Cross between two individuals with homozygous genotypes for a specific trait D. Cross between two unrelated species 2 In a monohybrid cross between TT and tt, what is the phenotypic ratio in the F2 generation? A. 1:1 B. 1:3 C. 3:1 D. 4:0 3 What is the genotypic ratio in the F2 generation of a monohybrid cross (TT × tt)? A. 1:1 B. 1:2:1 C. 2:1 D. 3:1 4 In Mendel's pea plant experiment, what character was completely absent in the F1 generation? A. Tall B. Dwarf C. Intermediate height D. Both A and B 5 Which of the following represents a homozygous genotype? A. Tt B. tt C. TT D. Tt and tt 6 What will be the appearance of (a) F1 and (b) F2 progenies when a pure (homozygous) tall pea plant is crossed with a pure (homozygous) dwarf pea plant? 7 When a plant homozygous for tall is crossed with a plant homozygous for dwarf, what will be the appearance of the offsprings of a cross of F1 with its tall parent. 8 When a plant homozygous for tall is crossed with a plant homozygous for dwarf, what will be the appearance of the off springs of a cross of F1 with its dwarf parent? 9 Work out for the genotypes of the parents of the cross between a tall and a dwarf pea plant which result into about one half of the tall and one half of dwarf off-springs. 10 Work out the probabilities of the off springs in a case when heterozygous tall hybrids of F1 generation are self-fertilized. Page 1 Email: Phone No: Website:
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