1. Genetics — the science that deals with heredity and factors affecting transmission of characteristics. 2. Recessive trait — a trait that is usually hidden and reappears in the second generation. 3. Phenotype — the appearance of the offspring. 4. Genotype — the genetic makeup of the offspring. 5. Homozygous — having two identical alleles of a particular gene. 6. Gregor Mendel — the father of the science of genetics. 7. (Partial) Expression — a trait that is being expressed (incomplete question).