|Most higher organisms reproduce sexually and they produce offspring through the union of reproductive cells from two different parents. Eg: Violets produce showy flowers that attract insects that carry pollen from one plant to the next. Offspring resulting from this cross-pollination are genetically distinct from either parent. Violets also produce flowers that never open, and are self-pollinated. The resulting offspring are genetically similar, though not identical, to the parent. And violets send out creeping stems. Plants sprouting from these runners are genetically identical to the parent plant.
High-impact journals are those considered to be highly influential in their respective fields. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.