Science
Heredity and Evolution
Practice questions
Which statement correctly explains the relation between heredity and variation?What is the main idea of the chapter Heredity and Evolution?What is the most correct relation between heredity and variation?Why is an offspring not exactly identical even when it resembles its parents?Why is a gene considered a unit of traits?Why is the chromosome number different in body cells and gametes?Why do all plants appear tall in the first generation when pure tall and pure dwarf pea plants are crossed?How can the dwarf trait reappear in the second generation even if it is not visible in the first generation?What does the 3:1 result in the second generation of a monohybrid pea cross show?If a recessive trait is visible, what conclusion about its gene forms is correct?If a plant has one dominant and one recessive form for a trait, what will usually be seen externally?Why can new trait combinations appear in the second generation of a dihybrid cross?What is the usual phenotypic ratio in the second generation of a dihybrid cross?What is the main difference between acquired and inherited traits?Why do strong muscles of an athlete usually not pass directly to his offspring?The example of cutting tails of mice is useful for explaining which idea?Why is variation alone not sufficient for evolution?Why can organisms with useful traits be more successful in natural selection?What is the main difference between natural selection and genetic drift?Why can the effect of genetic drift be stronger in a small population?