What will a hybrid plant resulting from two alternative alleles be called?

$A$ recessive mutant is one which:

Organisms that are phenotypically similar but genotypically different are said to be:

The pod character, specifically the green colour in pea plants, is:

Mendel published his work on the inheritance of characters in .......... but it remained unrecognized until the year ........ for several reasons.

Describe test cross. Why is it necessary?