Question

Which of Mendel's laws will always prove to be universally true in all cases?
A. All three laws
B. Only the second law
C. 2nd and 3rd law
D. 1st and 2nd law

Answer 1

Hint:Mendel used a pea plant for his experiment of genetics . Mendel uses seven contrasting pairs of characters. Mendel proposed 3 laws of genetics.

Complete answer: Mendel's first law was the law of dominance.
According to the law of dominance in a monohybrid cross, only one character is able to express itself. The character was said to be dominant in the other which cannot express itself was recessive. Incomplete dominance and codominance is an exception.
The Law of segregation is the second law of Mendel. It is a universal law. According to the law of segregation when two individuals both heterozygous for certain traits are crossed, for example, hybrids of the F1 generation. The offerings in the F2 generation differ in genotypes and phenotypes. So that the characteristics of grandparents regularly occur again.
The law of independent assortment was the third law of Mendel according to which the alleles for separate traits are passed independently of one another. Genetic linkage causes exceptions.

So the correct answer is (B).

Note:In incomplete dominance both the parents are not fully dominant so an intermediate is formed.
Codominance results due to the dominance of both the characters equally. The effect of both characters is shown.
In genetic linkage the genes are linked so crossing over is not independent.
Mendel was the first scientist to use mathematical analysis in biology. Mendel is also known as the father of genetics.