Multiple Choice 1) What is the difference between a monohybrid cross and a dihybrid cross? A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B) A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. C) A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves organisms that are heterozygous for two characters. D) A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice. 2) Paracrine signaling A) involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid. B) requires nerve cells to release a neurotransmitter into the synapse. C) occurs only in paracrine yeast cells. D) has been found in plants but not animals. 3) What is a genetic cross between an individual showing a dominant phenotype (but of unknown genotype) and a homozygous recessive individual called? C) a hybrid cross D) a dihybrid cross A) a self-cross B) a testcross