Question: 113. Which one of the following can be explained on the basis of Mendel’s Law of Dominance?
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 \mathrm{F}_{2} 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
Answer: Option (2)
Explanation:
Mendel’s Law of Dominance states that when two contrasting alleles are present together in a hybrid,
only one allele expresses itself while the other remains unexpressed.
Statement A is correct because the law explains that in a pair of alleles, one is dominant and the other is recessive.
Statement C is correct as Mendel proposed that factors occur in pairs in diploid organisms,
which is a basic assumption of Mendelian inheritance.
Statement D is correct because Mendel introduced the concept of discrete units of inheritance called factors, which control specific characters.
Statement E is correct since, in a monohybrid cross, only one of the parental characters is expressed in the \mathrm{F}_{1} generation due to dominance.
Statement B is incorrect because it describes codominance or incomplete dominance,
not Mendel’s Law of Dominance.
Therefore, the correct combination explained by Mendel’s Law of Dominance is A, C, D and E.