Principle of Inheritance and VariationMedium

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 blending 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 the F₁ generation of a monohybrid cross.

Choose the correct answer from the options given below:

Options

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

Solution

Sol. [Key Concept: Law of dominance and segregation]

According to Law of Dominance

1- Characters are controlled by discrete units called factors

2- Factors occur in pairs

3- In a dissimilar pair of factors one member of the pair dominates (dominant) the other recessive The law of dominance is used to explain the expression of only one of the parental characters in a monohybrid cross.

Law of segregation is based on the fact that the alleles do not show any expression and both the characters are recovered as such in $F_{2}$ generation

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