Unit 3 Test: Rebate

20 Questions | Total Attempts: 67

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Unit 3 Test: Rebate

Questions and Answers
  • 1. 
    A plant that is homozygous for red flowers (rr) is crossed with a plants that is homozygous for white flowers (ww). In the case of incomplete dominance, the flowers of the offspring will be ___.
    • A. 

      Red and white

    • B. 

      White only

    • C. 

      Red only

    • D. 

      Pink only

  • 2. 
    An allele is dominant in a heterozygote when it is
    • A. 

      Expressed and the other allele is not.

    • B. 

      A very common allele in the population.

    • C. 

      The weaker of the two alleles.

    • D. 

      More desirable than the other allele.

  • 3. 
    Which law states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
    • A. 

      Law of genetic linkage

    • B. 

      Law of segregation

    • C. 

      Law of independent assortment

    • D. 

      Law of inheritance

  • 4. 
    Mendel's second law of genetics, the law of independent assortment, is one explanation of the
    • A. 

      Random fertilization of gametes.

    • B. 

      Genetic variation within species.

    • C. 

      Greater strength of dominant alleles.

    • D. 

      Final stages of gametogenesis.

  • 5. 
    For an XX female to express a recessive sex-linked trait, she must have
    • A. 

      A Y chromosome.

    • B. 

      An inactivated allele.

    • C. 

      Two recessive alleles.

    • D. 

      Two dominant alleles.

  • 6. 
    A child is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could the parents have?
    • A. 

      RR and RR

    • B. 

      Rr and RR

    • C. 

      Rr and rr

    • D. 

      RR and rr

  • 7. 
    Any of the alternative forms of a gene that occurs at a specific place on a chromosome are known as ___.
    • A. 

      Alleles

    • B. 

      Genes

    • C. 

      Chromosomes

    • D. 

      Recessive traits

  • 8. 
    ___ studied traits of pea plants and discovered the two fundamental laws of genetics.
    • A. 

      Mendel

    • B. 

      Watson and Crick

    • C. 

      Mack

    • D. 

      Einstein

  • 9. 
    In humans, a ___ cell has ___ chromosomes.
    • A. 

      Haploid ... 46

    • B. 

      Haploid ... 23

    • C. 

      Diploid ... 50

    • D. 

      Diploid ... 23

  • 10. 
    Homologous chromosomes exchange information from time to time through a process called crossing over. During which stage of meiosis does this occur?
    • A. 

      Prophase I

    • B. 

      Metaphase II

    • C. 

      Prophase II

    • D. 

      Telophase I

  • 11. 
    The cells in the ovaries and testes that actually go through meiosis to produce haploid cells are called ___.
    • A. 

      Germ cells

    • B. 

      Oocytes

    • C. 

      Spermatocytes

    • D. 

      Gametes

  • 12. 
    A form of nuclear division that divides a diploid cell into haploid cells and produces gametes is known as ___.
    • A. 

      Mitosis

    • B. 

      Meiosis

    • C. 

      Cellular regeneration

    • D. 

      Binary fission

  • 13. 
    A female gamete ___.
    • A. 

      Is produced in the testes.

    • B. 

      Is called an ovum or an egg cell.

    • C. 

      Is called a spermatocyte.

    • D. 

      Is called a polar body.

  • 14. 
    Cells that have only one copy of an organisms chromosomes are said to be ___.
    • A. 

      Somatic cells

    • B. 

      Diploid cells

    • C. 

      Haploid cells

    • D. 

      Binary cells

  • 15. 
    Cells that are produced by germ cells through the process of meiosis are called ___.
    • A. 

      Somatic cells

    • B. 

      Gametes

    • C. 

      Diploid cells

    • D. 

      Binary cells

  • 16. 
    Messenger RNA is formed in the process of ___.
    • A. 

      Transcription

    • B. 

      Translation

    • C. 

      Replication

    • D. 

      Mutation

  • 17. 
    Watson and Crick, with the help of Rosalind Franklin, were the first to suggest that DNA is ___.
    • A. 

      A short molecule

    • B. 

      A protein molecule

    • C. 

      The shape of a double helix

    • D. 

      The genetic material

  • 18. 
    Which of the following statements about DNA and RNA is true?
    • A. 

      RNA is arranged in a double helix.

    • B. 

      The kinds of sugar in the nucleotides of DNA and RNA differ.

    • C. 

      DNA contains nitrogenous bases and phosphates, while RNA does not.

    • D. 

      DNA contains uracil, while RNA contains thymine.

  • 19. 
    What does the circle represent in this diagram of a nucleotide?
    • A. 

      Phosphate group

    • B. 

      Nitrogenous base

    • C. 

      Pentose sugar

    • D. 

      Adenine base

  • 20. 
    Which of the following is a pair of complementary bases?
    • A. 

      Cytosine and cytosine

    • B. 

      Thymine and adenine

    • C. 

      Adenine and guanine

    • D. 

      Thymine and ctyosine

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