1. homologous chromosomes line up in the center of the cell 2. the sister chromatids separate into individual chromosomes and move apart 3. 4 (N) haploid daughter cells form 4. the haploid number of chromosomes line up in the center of the cell 5. cells undergo DNA replication 6. nuclear membrane forms around 4 haploid nuclei 7. 2 (N) haploid daughter cells form 8. the nuclear membrane breaks down 9. the nuclear membrane reforms creating two cells each with 2 nuclei 10. crossing over (if any) occurs 11.nuclear membrane forms around pairs of sister chromatids 12. spindle fibers pull homologous pairs to opposite ends of the cell

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.