A fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true? A.

The trait for spore color is determined by exactly one gene.

B.

The trait for spore color is determined by more than one gene.

C.

The allele for black spores is dominant over that for white spores.

D.

The allele for white spores is dominant over that for black spores.