Question

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 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:

• A. A, B and C only
• B. A, C, D and E only
• C. B, C and D only
• D. A, B, C, D and E

Answer 1

The Correct Option is B

Mendel's Law of Dominance is one of the foundational principles of genetics articulated by Gregor Mendel. It explains the behavior of alleles in heterozygous organisms, where one allele masks the expression of the other.

A. Out of one pair of factors, one is dominant and the other is recessive. This directly relates to Mendel's Law of Dominance, which states that when two different alleles are present in an organism, one (the dominant allele) will mask the other (the recessive allele).

B. Alleles do not show any expression, and both characters appear in the F₂ generation. This refers to Mendel's Law of Segregation rather than dominance, as it describes the separation of alleles during gamete formation.

C. Factors occur in pairs in normal diploid plants. This is consistent with Mendel's observations and principles about genetic inheritance, reflecting the diploid nature where alleles exist in pairs.

D. The discrete unit controlling a particular character is called a factor. Mendel used the term "factor" to describe hereditary units, known today as genes, which is essential to Mendelian genetics principles.

E. The expression of only one of the parental characters is found in a monohybrid cross. This is a direct implication of Mendel's Law of Dominance, where one parental trait is expressed over the other in the F1 generation.

The correct answer is A, C, D and E only, as each directly reflects aspects explained by Mendel's Law of Dominance.