Bio3400 Chapter 7 Sex Determination and Sex Chromosomes
  1.         reproduction involving meiosis and                is important in many multicellular organisms.

  2. Chlamydomonas gametes are          and consist of two         types, though there is no genetic difference between the         types.

  3. Maize is a             (sporophyte contains both male and female parts) plant that exhibits alternation of              , with a dominant             stage and a              stage.

  4. Sexual development in the nematode Caenorhabditis elegans is determined by the ratio of    chromosomes to sets of            .

  5. In the           mode and          mode of sex determination, gametes from the                sex determine the sex of the progeny.

  6. Humans possess     chromosomes: 22 pairs of            and two      chromosomes.

  7.                 of the X chromosomes (failure to segregate) during meiosis results in sex chromosome             such as              syndrome and         syndrome.

  8. Other sex chromosome abnormalities include         and         aneuploidies.

  9. In humans, the      region on the    chromosome is necessary for male development.

  10. In mammalian females, one of the two X chromosomes in each cell is randomly              during embryonic development and can be seen as a compact       body.

  11. A female heterozygous for an X-resident gene may exhibit a         phenotype.

  12. Sex determination in Drosophila depends on the        of    chromosomes to autosomes; loss of an X during development can result in a bisexual fly called a                .

  13. Many reptiles exhibit              -dependent sex determination (TSD), which can be one of three modes.