Yes, Zac Brown is indeed the lead singer of the Zac Brown band.
Crossover definition, a bridge or other structure for crossing over a river, highway, etc. See more.
Crossovers occur when homologous chromosomes are aligned: chromatids from two different chromosomes can exchange segments as in Fig. 3. In Fig. 3a, chromatids from two homologous chromosomes come in contact at an equivalent point along their lengths.