Question

Walter Sutton is famous for his contribution.
A. Chromosomal theory of inheritance
B. Genetic engineering
C. Totipotency
D. Quantitative genetics

Answer 1

Walter Sutton was an American geneticist and physician. He had given his contributions to present-day biology. Walter Sutton studied grasshopper; he connected the phenomena of meiosis, segregation, and independent assortment with the chromosomal theory of inheritance in the early twentieth century in the US. He studied chromosomes and called it the inheritance mechanism.

Complete answer:
Option A Chromosomal theory of inheritance: Walter Sutton is famous for his contribution to the Chromosomal theory of inheritance. The chromosomal hypothesis of inheritance holds that genes are found in certain places on chromosomes and that chromosome behavior is predictable. The behavior of chromosomes during meiosis can be explained by Mendel’s laws of inheritance.
Option A is correct.
Option B Genetic engineering: Genetic engineering is the process of using recombinant DNA technology. The alteration of one or more genes is referred to as genetic engineering. Genetic engineering is used for mass-producing insulin, human growth hormones. Stanley N Cohen discovered Genetic engineering.
Option B is incorrect.
Option C Totipotency: Totipotency is the ability of a single cell to divide and produce differentiated cells in an organism. Examples of Totipotent cells are Spores and zygotes. Gottlieb Haberlandt discovered Totipotency. He is also known as the father of plant tissue culture.
Option C is incorrect.
Option D Quantitative genetics: Quantitative genetics deals with the phenotypes that vary continuously. The reason for the continuous variation is due to the traits. Quantitative genetics allows one to estimate heritability. R. A Fisher discovered Quantitative genetics.
Option D is incorrect.

Therefore, Option A. Chromosomal theory of inheritance is the correct answer.

Note:
Chromosomal theory of inheritance is discovered by waler Sutton. The Chromosomal theory of inheritance came into existence in the early $1900$. This is the fundamental theory of genetics. Walter Sutton discovered this when he was $25$ years old. Chromosomes are the basis of heredity, and that reduction of the chromosomes in meiosis is directly related to Mendel’s law of inheritance.