Genes are the.....

$A$ cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: In an experiment, Mendel observed that the $F1$ progeny plants are all tall and none are dwarf.
Reason $R$: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.
In the light of the above statements, choose the most appropriate answer from the options given below:

Mendel's findings were first published in the journal titled:

Define/Explain: Test cross.

Who rediscovered the results of Mendel's experiments?