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Studying the Genetics of Development quiz

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  • What are the four main questions scientists ask when studying the genetics of development?
    They ask which genes control development, when and where these genes are expressed, how they are regulated, and what happens if these genes are defective.
  • Why are model organisms used in developmental genetics studies?
    Model organisms are used because they are easy to study, reproduce rapidly, and have genetic similarities to humans.
  • Name three commonly used model organisms in developmental genetics.
    Yeast, fruit flies (Drosophila), and C. elegans (a type of worm) are commonly used.
  • What is a zygote and what is its key characteristic?
    A zygote is a fertilized egg, and it is totipotent, meaning it can develop into any cell type.
  • What is the process called when a cell becomes committed to a specific fate?
    This process is called determination.
  • What is mosaic determination in development?
    Mosaic determination is when each cell has a predetermined fate, and if a cell is lost, it cannot be replaced, leading to abnormal development.
  • How does regulative determination differ from mosaic determination?
    In regulative determination, cells can adjust their fates based on environmental conditions, allowing other cells to compensate if one is lost.
  • What happens if a cell is destroyed early in mosaic development?
    Abnormal development occurs because the lost cell's fate cannot be replaced.
  • What is the outcome if a cell is destroyed early in regulative development?
    Development is often normal because other cells can compensate for the loss.
  • What does the Variable Gene Activity Hypothesis state?
    It states that cell determination is controlled by the activation or inactivation of specific genes.
  • Why is gene regulation important in development?
    Gene regulation determines which genes are turned on or off, controlling how cells differentiate into various types.
  • What makes C. elegans a particularly useful model organism for studying development?
    Every cell in C. elegans can be tracked from the single-cell stage to adulthood, allowing precise study of cell fate.
  • What does totipotent mean in the context of a zygote?
    Totipotent means the zygote can develop into any cell type in the organism.
  • In which type of determination can cells adjust their fate if something goes wrong?
    Cells can adjust their fate in regulative determination.
  • How do scientists test the function of genes in development?
    They introduce mutations or study naturally occurring mutations to observe how development is affected.