Hint: Zoology is a branch of science that usually involves animal study. Heredity involves the transfer of characters from the parents to offspring. This information is present in the DNA of the organisms. The DNA or chromosomes acts as a blueprint to carry information from parents to offspring.
Complete step-by-step answer:
The transfer of characters from parents to offspring so as to ensure that offspring resembles their parents is known as inheritance. Progeny produced resembles the parents closely but is not identical in all the respects that is only some features resemble and not all. The reason behind is variation. Variation is the degree by which progeny differ from their parents. The branch of science which deals with the inheritance as well as the variation of characters from parents to offspring is Genetics.
Now let’s study about given options: -
Genetics: The branch of science which deals with the inheritance that is transfer of characters, hereditary characters, as well as the variation of characters from parents to offspring is Genetics.
Eugenics: It is a study or can be said a practice in which organisms are mated so we get the desirable characteristics and a large progeny. It has a great role in improving the food resources.
Euthenics: It is the science which involves the internal well-being that is making organisms disease free and healthy by improving external and environmental conditions. This can be ensured by supplying clean drinking water.
Cytology: It is a science that involves the study of cell and cell structure of both animals and plants. It includes cell structure, cell size, cell shape and cell composition.
Hence, the correct answer is option (A). Genetics.
Note: Mendel was the first that told about the inheritable characters and so called as the father of genetics. He took a pea plant and worked on this. He selected 7 characters of pea to ensure the study of hereditary.