Final answer:
False. Genes do not always act in a dominant-recessive fashion. Mendel's law of dominance explains that one trait will conceal the presence of another trait in a heterozygote. The dominant allele is expressed exclusively while the recessive allele remains latent but can be transmitted to offspring.
Step-by-step explanation:
False. All genes do not act in a dominant-recessive fashion. Mendel's law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. The dominant allele will be expressed exclusively, while the recessive allele will remain latent but can be transmitted to offspring. The recessive trait will only be expressed by offspring that have two copies of the recessive allele.