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, a cornerstone of genetics established by Gregor Mendel, elucidates how alleles behave in organisms with two different alleles (heterozygous individuals). In such cases, one allele suppresses the expression of the other.

A. From a pair of genetic factors, one is dominant and the other is recessive. This statement directly aligns with Mendel's Law of Dominance, which posits that when an organism possesses two distinct alleles for a trait, the dominant allele will obscure the phenotypic expression of the recessive allele.

B. Alleles do not manifest any expression, with both characters appearing in the F₂ generation. This description pertains more to Mendel's Law of Segregation, which concerns the separation of alleles during the formation of gametes, rather than dominance.

C. In typical diploid plants, genetic factors exist in pairs. This principle is consistent with Mendel's experimental findings and genetic theories, reflecting the diploid nature of organisms where alleles are present in homologous pairs.

D. A discrete hereditary unit that governs a specific characteristic is termed a factor. Mendel employed the term "factor" to denote these hereditary units, now recognized as genes, a concept fundamental to Mendelian genetics.

E. In a monohybrid cross, the expression of only one of the parental traits is observed. This is a direct consequence of Mendel's Law of Dominance, where one parental trait prevails over the other in the F1 generation.

The correct selections are A, C, D, and E only, as each accurately represents an aspect explained by Mendel's Law of Dominance.