Explain the law of dominance using a monohybrid cross.

Solution

Law of Dominance states that
i. characters are present as dicrete units called Factors.
ii. Factors occur in pairs.
iii. In the condition where dissimilar factors are present one expresses itself and is called Dominant whereas the other does not express itself and is called recessive.

The law explains the expression of only one factor in a monohybrid cross.
For example
If we cross a Pure tall( TT) and a Pure dwarf (tt) with each other then in the First filial generation (F1) we get only Tall plants (Tt) even when two discrete factors T and t are present. Thus we can say that T factor is dominant over t factor as it expresses itself even in the dissimilar condition. The t factor is recessive as it expresses only in the homozygous condition (tt) in the Second filial generation where Tt and Tt are selfed.

. A Punnett square used to understand law of Dominance using monohybrid cross.

Some More Questions From Principles of Inheritance and Variation Chapter

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Principles Of Inheritance And Variation

Explain the law of dominance using a monohybrid cross.

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