Question

crossing a bb parent with a bb parent results in a bb, bb and bb offspring. b half bb and half bb offspring. c b or b offspring. d all bb offspring.

Explanation:

When crossing a homozygous dominant (BB) parent with a homozygous recessive (bb) parent, each parent contributes one allele. The BB parent can only contribute a B allele, and the bb parent can only contribute a b allele. So all offspring will have the genotype Bb.

Answer:

d. all Bb offspring.