Transition-sentences bring out the logical relation between ideas. You want your paper to read like a continuous argument which good transitions help to facilitate. Words like however, so, additionally do indicate a logical relation between paragraphs, but they are weak. A strong transition makes the relation explicit.
segregation. n. 1. the act of segregating or state of being segregated. 2. (Sociology) sociol the practice or policy of creating separate facilities within the same society for the use of a minority group. 3. (Genetics) genetics the separation at meiosis of the two members of any pair of alleles into separate gametes.
[Refresher on the law of segregation] The law of segregation states that each gamete (sperm or egg cell) made by an organism will get just one of the two gene copies present in a parent organism, and that the gene copies are randomly allocated to the gametes.