4. In fish, rough scales are dominant to smooth
scales. Pick a letter to represent the gene for scale
texture. Write the letters that represent the dominant
and recessive alleles of this gene.

For the gene, I use S and s. Dominant alleles would look like, SS, or Ss. Recessive alleles would look like: ss.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs