A plant with red flowers was crossed with one having yellow flowers. If F 1 showed all flowers in orange colour, explain the inheritance.

The dominance of a particular trait over the other trait may not be complete. This condition is called incomplete dominance. Let the red flowers have genotype RR and yellow flowers have genotype rr. Since the red colour fails to completely dominate the yellow colour, the F1 generation produces orange colour.

E M B I B E

Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 8

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Earn 100

Explain the following term with examples:

Co-dominance

Important Questions on Principles of Inheritance and Variation

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 8

Explain the following term with examples:

Incomplete dominance

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 9

Write a brief note on chromosomal mutations.

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 9

Write a brief note on gene mutations.

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 10

How was it concluded that genes are located on chromosomes?

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 11

A plant with red flowers was crossed with one having yellow flowers. If F₁ showed all flowers in orange colour, explain the inheritance.

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 12

Define Law of Segregation.

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 12

Define Law of Independent Assortment.

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Intermediate Second Year Botany>Chapter 9 - Principles of Inheritance and Variation>Questions>Q 13

In peas, the tallness is dominant over dwarf-ness and the violet colour of flowers is dominant over the white colour. When a tall plant bearing violet flowers was pollinated with a dwarf plant bearing white flowers, different phenotypic groups were obtained in the progeny in numbers mentioned against them:

Tall, Violet = 138

Tall, White = 132

Dwarf, Violet = 136

Dwarf, White = 128

Mention the genotypes of the two parents and of the four offspring types.