Clarissa does a three point cross using alleles for the hairy (alleles h or H), big (alleles b or B), and singed (alleles sn or SN) genes of Drosophila. These three genes are located on the same chromosome, but the order of these genes along the chromosome is not known

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides