Gregor Mendel is known as the Father of because of his work with pea plants. Alleles

It denatures and coagulates during cooking.

Explanation:

Denaturation is a phenomenon in which the proteins undergo changes in their secondary, tertiary or Quaternary structures. They undergo change in their native state.  

The changes are may be due to heat treatment, application of strong acidic or basic conditions, addition of some salts or solvents or exposure to radiations.  

So if we heat a steak of protein, it loses its native structure and said to be denatured. During this it may also undergoes coagulation.