1) Are the X and Y chromosomes identical to each other? Are there genetic differences between the two? Based on this, would you say that they are truly "homologous," or not? If not, why not? 2) True or False The sex chromosomes are named due to their shape, with the X chromosome being X-shaped, and the Y-chromosome being Y-shaped. 3) What is meant by the term "recombinants?" What exactly causes "recombinant type" offspring? 4) In what specific way is a linkage map different from modern day genetic maps (genome map)?.