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.
The classical example of a change in phenotype associated with unequal crossing-over is the. X-linked Bar (B) locus of Drosophila melanogaster. A duplication of the 16A region of the X. chromosome gives th-eye mutation, where the eye is reduced in size to a narrow vertical bar e Bar.