Which one of the following can be explained on the basis of Mendelβs 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 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.
medium
Principles of Inheritance and Variation
2024
biology
B, C and D only
A, B, C, D and E
A, B and C only
A, C, D and E only
Explanation
To solve this problem, we need to determine which statements can be explained by Mendel's Law of Dominance. Let's analyze each statement:βA. Out of one pair of factors one is dominant and the other is recessive. - This directly describes Mendel's Law of Dominance, which states that in a pair of contrasting traits, one trait is dominant and masks the expression of the other, which is recessive.βB. Alleles do not show any expression and both the characters appear as such in F2β
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- This statement is incorrect in the context of Mendel's Law of Dominance, as it suggests co-dominance or incomplete dominance, not the classical dominance described by Mendel.
β
C. Factors occur in pairs in normal diploid plants.
- This is related to Mendel's Law of Segregation, which states that alleles occur in pairs and segregate during gamete formation. While related, it is not specifically about dominance.
β
D. The discrete unit controlling a particular character is called factor.
- This is a general statement about Mendelian genetics, referring to what we now call genes. It is not specifically about dominance.
β
E. The expression of only one of the parental characters is found in a monohybrid cross.
- This is a direct consequence of Mendel's Law of Dominance, where the dominant trait is expressed in the
F1β
generation.
Now, let's identify which statements are explained by Mendel's Law of Dominance:
A and E are directly explained by the Law of Dominance.