What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.17.1.1Genetic and environmental variation• Phenotypic variation: genetic factors, environmental factors, or combinationSyllabus objective17.1.2Discontinuous vs continuous variation• Discontinuous vs continuous variationSyllabus objective17.1.3Genetic basis of variation• Genetic basis of discontinuous and continuous variationSyllabus objective17.1.4T-test to compare means of two samples• t-test to compare means of two samplesSyllabus objective