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Solution - Explain the Law of Dominance Using a Monohybrid Cross. - Inheritance of One Gene - Law of Dominance

ConceptInheritance of One Gene Law of Dominance

Question

Explain the Law of Dominance using a monohybrid cross.

Solution

When two different factors (genes) or a pair of contrasting forms of a character are present in an organism, only one expresses itself in the F, generation and is termed as dominant while the other remains unexpressed and called recessive factors (gene).

A tall (TT) true breeding plant is crossed with a dwarf (tt) plant. The character of height is represented by‘T’ for tall‘t’ for dwarf are the alternate form as character of height. The Fj hybrid ‘Tt’ is Tall, showing that tall is dominant over dwarf while dwarf remains unexpressed in F, offspring due to phenomenon of dominance by tall factor or gene.In this Tt heterozygous has tall phenotype showing T is dominant over t allele.

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APPEARS IN

NCERT Biology Textbook for Class 12
Chapter 5: Principles of Inheritance and Variation
Q: 4 | Page no. 93

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