Mendel Performed a Testcross with His Plants and All the Resulting

Multiple Choice

Mendel performed a testcross with his plants and all the resulting progeny had the same colour. What information did this testcross provide?

A) The parent with the dominant trait is homozygous.
B) The parent with the dominant trait is heterozygous.
C) The parent with the recessive trait is heterozygous.
D) The parent with the recessive trait is homozygous.