Question

Assertion: The principle of segregation given by Mendel is the principle of purity of gametes.
Reason: Gametes are pure for a character.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer 1

Hint: The single allele enters gamete, which implies gametes will be pure for any trait and this is the reason this law is also known as the “Law of Purity of Gametes”. “Law of purity of gametes” is also known as Mendel’s Law of segregation.

Complete answer: Characters that remain together in an organism do not get jumbled but they keep their unique identity distinctive. The alleles get separated during the time of sporogenesis or gametogenesis. Then, these traits get distributed randomly to different gametes and then eventually to the offspring according to the principle of probability. The two gametes carry a single factor or allele for one trait. In the F1 plants, the two Mendelian factors segregate during the process of gamete formation. Due to the principle of segregation of the two Mendelian factors, one gamete receives only one factor out of a pair of traits. As a result of this, the gametes are always pure for any character.
Mendel's four postulates which constitute the laws of inheritance are listed below:
(1) The principles of paired factors.
(2) The principle of dominance.
(3) The law of segregation, also known as the law of purity of gametes or Mendel’s first law of inheritance receiving only one factor out of a pair.
(4) The law of independent assortment, also known as Mendel's second law of inheritance.
So, the correct answer is option A.

Note: Mendel's law of dominance states that one trait will obscure the presence of an alternative trait in a heterozygote, for the same characteristic. Instead of both the alleles of a trait contributing to a single phenotype, only the dominant allele will be expressed completely.