Science
Heredity and Evolution
Practice questions
In the second generation of a dihybrid cross, what does the 9:3:3:1 ratio indicate?Why should evolution not be seen as a ladder from the simplest to the best organisms?How is the evolution of a complex organ like the eye explained?How is the development of drug resistance in bacteria related to natural selection?If a few birds reaching an island have variation in beak size, what may happen because of different food sources?Which is a correct example of artificial selection?What does the example of different vegetables derived from wild cabbage show?Why can it be difficult to consider two similar-looking organisms as the same species using appearance alone?What role can mutation play in evolution?In which situation can natural selection make a trait more common in a population?After a storm on an island, only a few lizards survive and form the new population. What effect does this show?What is the importance of a vestigial organ in the study of evolution?Human ear muscles and appendix can be placed under which type of organs?Why are offspring of the same parents not exactly identical?Why is a pedigree chart useful in studying inherited diseases?If a recessive disease appears only when both factors are recessive, why does risk increase when both parents are carriers?How should adaptation in an organism be understood?Why are both similarity and variation important from the viewpoint of evolution?If two offspring receive hereditary information from the same parental sources yet look different, what is the deepest reason?How should the relation between a gene and a trait be understood most correctly?