Color-blindness is a sex-linked (also called X-linked) trait in humans.A woman who is a carrier for color-blindness has children with a man who is colorblind. Their son, Frank, marries a woman who is neither colorblind nor a carrier.Their daughter, Mariana, marries a man who is colorblind.Which of the following is a certainty (not just possible, but certain to be true)?

MCQs on how organisms evolve over time, with particular emphasis on natural selection, evolution, speciation, phylogeny and taxonomy, and aspects of genetics and inheritance. As well as the study of population ecology and ecosystems.