Question

which is the best example of a hypothesis leading to new experimental methods?
gregor mendel influenced the development of the theory that everything is made of cells.
gregor mendel continued the genetic research of thomas hunt morgan, but mendel used pea plants.
thomas hunt morgan continued the genetic research of gregor mendel, but morgan used fruit flies.
the theory that everything is made of cells influenced gregor mendel in his research.

Explanation:

Thomas Hunt Morgan continued Mendel's genetic research but used fruit - flies. This change in experimental organism was likely due to new hypotheses about genetics, leading to a new experimental method. Mendel used pea plants. The other options do not show a hypothesis leading to new experimental methods. For example, Mendel did not influence the cell - theory development, and the cell - theory influencing Mendel is not about a hypothesis leading to new experimental methods. Also, the statement about Mendel continuing Morgan's research is incorrect as it was the other way around.

Answer:

Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.