Chapter 10.2 - Genes And Chromosomes

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Chapter 10.2 - Genes And Chromosomes

This is a Lesson, not a quiz. Turn to page 263 in your textbook. All answers are based on the information in Chapter 10. 2. Fill in the blanks carefully and check your spelling.


Questions and Answers
  • 1. 
    The cells of the human body all contain 46 chromosomes each. How many of those chromosomes came from the father?
  • 2. 
    If each cell in human beings contain 46 chromosomes, how many came from the mother?
  • 3. 
    Is 46 the haploid or diploid number of chromosomes for humans?
    • A. 

      Haploid

    • B. 

      Diploid

    • C. 

      Neither

  • 4. 
    The two chromosomes that make up a pair are called ____ chromosomes.
  • 5. 
    Each chromosome in a homologous pair contains genes for the same ____.
  • 6. 
    A trait is a genetic characteristic of an individual. Check each box below that represents a trait for a human.
    • A. 

      Eye color

    • B. 

      Finger length

    • C. 

      Manners

    • D. 

      Hair length

    • E. 

      Height

  • 7. 
    Look at the Problem-Solving Lab on page 264. Alleles are paired genes on homologous chromosomes. They are for the same trait, but they might represent that trait differently. For example, there is a gene for eye color on each gene in a homologous pair, but one might be for blue eyes and one for brown eyes. In a diagram, the blue eyed gene might be represented by a lower-case letter and brown eyes might be shown with a capital letter, but it would be the same letter.Look at Chromosome #1. The letters represent genes. Which of the other chromosomes might be homologous with chromosome 1?
    • A. 

      Chromosome 2

    • B. 

      Chromosome 3

    • C. 

      Chromosome 4

    • D. 

      Chromosome 5

  • 8. 
    Humans have 46 chromosomes in each cell. When gametes are formed how many chromosomes does each gamete have?
  • 9. 
    A dog has 78 chromosomes but a chimp has 48. That means a dog is genetically more complex than a chimp.
    • A. 

      True

    • B. 

      False

  • 10. 
    When homologous pairs of chromosomes pair up during meiosis (Prophase I), sometimes genetic material is exchanged between them. This process is called ____ ____.
  • 11. 
    Mitosis produces identical copies of chromosomes in a cell, but meiosis is different. Crossing over and the independent segregation of chromosomes during meiosis can be a source of ____ among organisms.
  • 12. 
    A mistake during meiosis called nondisjunction sometimes causes a gamete to have an extra chromosome or to be missing a chromosome. In humans, a disorder called Down's syndrome results from an extra chromosome in the 21st pair. Humans with Down's syndrome have how many chromosomes in their cells?
  • 13. 
    Organisms that has more than the normal number of chromosome sets are called ____.
  • 14. 
    In plants, polyploidy is common and results in healthier individuals. In animals, however, polyploidy is rare, and it almost always results in the death of the ____.
  • 15. 
    When genes are inherited together because they occur close together on the chromosome, they are said to be ____.