background-color: #eee; Chromosome 1 is the X chromosome (sex chromosome) and is responsible for sex determination in the fruit fly. [CDATA[ */ "Hyrax: The Little Brother of the Elephant", Peigler, Richard S. ["Wild silks of the world. In Drosophila melanogaster, sex is determined by the ratio of the number of X chromosomes to the number of haploid sets of autosomes asked Sep 9, 2016 in Biology & Microbiology by Harlie Indicate whether the statement is true or false 1b ). margin-top: 0; Patterns of puffing activity in the salivary gland chromosomes of Drosophila. In species with smaller population sizes, the probability of encountering a mate (Gowaty and Hubbell 2009) may be low, especially at certain times of the year or in certain parts of the species range. Of those few surviving the early larval period, approximately 20% subsequently die as late larvae. His interspecific crosses were infertile, but in some cases, mating to a heterospecific male was sufficient to trigger oviposition of unfertilized eggs that subsequently gave rise to parthenogenetically produced adult female flies. /*