Other genetic traits are determined by more than one gene. The reproductive system. Sexually reproducing organisms have two sets of chromosomes in most cells of their bodies. Each parent contributes one of each pair of chromosomes to its offspring randomly. Genetic and Environmental Determinants Together with the environment, an organism's genes influence its appearance and characteristics.
Genotype gives rise to pheno-type.
Acquired vs. inherited traits. Nature vs. Nurture. The DNA information in genes provides instructions for building proteins. Proteins carry out life functions and are a diverse collection of molecules that includes hormones, enzymes, structural proteins, and antibodies. The genetic code.