What happens during crossing over? homologous chromosomes trade pieces of dna. sister chromatids form tetrads and line up randomly. tetrads separate and produce two haploid daughter cells. spindle fibers form and attach to centromeres.

What causes an unsaturated fatty acid to have a different shape than a saturated fatty acid? o a. unsaturated fatty acids have more hydrogen atoms. o b. unsaturated fatty acids have double carbon bonds. o c. unsaturated fatty acids have more nitrogen atoms. o d. unsaturated fatty acids have single carbon bonds.