Question

Question 4: Explain the Law of Dominance using a monohybrid cross.

Class 12 - Biology - Principles of Inheritance and Variation Page 93

Answer 1

The Law of dominance is given by Mendel, which is stated as below: "In a cross of parental generations that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype.

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Answer 2

In monohybrid progeny Mendal first crossed pure-bred tall pea plants with pure-bred dwarf pea plants and found that only tall pea plants were produced in the first generation or F1 generation. No dwarf pea plants( or short pea plants) were obtained in the first generation of progeny. From this Mendel concluded the first generation showed the traits of only one of the parent plants: tallness. The trait of other parent plant, dwarfness, did not show up in the progeny of first generation.