When you visit a DDS Customer Service Center, you'll need: 1  your birth certificate, your current US passport or other proof of citizenship. 2  your Social Security Card or other verification of your Social Security Number.  two proofs of residence (recent utility bills, bank statements and rental contracts all work)
Crossing over begins early in prophase I of meiosis. At the time, homologous chromosomes Are paired along their lengths. Each gene on one homologue ia alined precisely with thâ¦e corresponding gene on the other homologue.
If crossing over didn't happen during meiosis in humans, the haploid daughter cells would all have the same genes. The crossing over creates variation and causes each daughterâ¦ cell to have slightly different genes. Answered by The WikiAnswersÂ® Community. Making the world better, one answer at a time.