Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance.
Reason (R): The pairing and separation of a pair of chromosomes would lead to the blending of the pair of factors they carried.
In the light of the above statements, choose the most appropriate answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) is true but (R) is false.
Assertion (A): Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance. — True. Sutton and Boveri saw that chromosomes behave like Mendel’s factors, and Sutton joined the two ideas into the chromosomal theory of inheritance.
Reason (R): The pairing and separation of a pair of chromosomes would lead to the blending of the pair of factors they carried. — False. Sutton and Boveri argued that the pairing and separation of a pair of chromosomes would lead to the segregation of the pair of factors. Mendel had shown that the factors do not blend; they separate into different gametes, just as the two chromosomes of a pair do.
A is true and R is false.
NCERT Extract:
Chromosomal Theory of Inheritance – “Sutton and Boveri argued that the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried. Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance.”