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Solution


Q.

Which one of the following can be explained on the basis of Mendel’s Law of Dominance                 [2024]
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in F2 generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.

Choose the correct answer from the options given below:
1 A, B and C only  
2 A, C, D and E only  
3 B, C and D only  
4 A, B, C, D and E  

Ans.

(2)

According to Mendel’s law of dominance:

(i) Characters are controlled by discrete units called factors.

(ii) Factors occur in pairs.

(iii) Out of the two factors (alleles), only one expresses itself in the hybrid (heterozygous) as well as homozygous state called dominant and prevents the expression of another factor which is called recessive.

The law is used to explain the expression of only one of the parental characters in a monohybrid cross in the F1 generation and the expression of both in the F2 generation.