Chapter 3 Study Questions

    1. Species A has n=4 chromosomes and Species B has n=6 chromosomes. Can you tell from this information which species has more DNA? Can you tell which species has more genes?
    2. The answer to question 1 implies that not all DNA within a chromosome encodes genes. Can you name any examples of chromosomal regions that contain relatively few genes
      1. How many centromeres does a typical chromosome have?
      2. What would happen if there was more than one centromere per chromosome?
      3. What if a chromosome had no centromeres?
    3. For a diploid organism with 2n=16 chromosomes, how many chromosomes and chromatids are present per cell at the end of:
      1. G1
      2. S
      3. G2
      4. mitosis
    4. Refer to Table 3.4.1.
      1. What is the relationship between DNA content of a genome, number of genes, gene density, and chromosome number?
      2. What feature of genomes explains the c-value paradox?
      3. Do any of the numbers in this Table show a correlation with organismal complexity?



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