What purposes do crossing over and independent assortment play in cell division?

Crossing over happen when prophase I of meiosis I. It involves the exchanging of genes between the non-sister chromatids of homologues which allows the novel mixture of maternal and paternal genetic material with new, recombining chromosomes. Chromosomes maternal and paternal chromosomes line up during. Certainly, it is complete not chosen which sperm fertilizes which egg which creates even more potential variation in the offspring.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.