Which of the Following is True of Geneticists at the Beginning

Question

Which of the following is true of geneticists at the beginning of the twentieth century?
A) They thought that inheritance was fundamentally discontinuous.
B) They argued that Mendelian genetics supported Darwin's idea that adaptation occurs through the accumulation of small variations.
C) They agreed that evolution was proceeded by the gradual accumulation of small changes.
D) They believed that genes had no discernible effect on phenotypes.

Accepted Answer

At the beginning of the twentieth century, geneticists believed that inheritance was fundamentally discontinuous, meaning that traits were either inherited in a strictly dominant or recessive manner. This view was challenged by later discoveries in genetics, such as the concept of incomplete dominance and codominance.