Genetics test 1 real

  1. A chromosome with two arms of equal length is referred to as




    C. metacentric
  2. If yellow and round phenotypes phenotypes in peas are dominant, you know the genotype of all peas that are green and wrinkled
    a. True
    b. False
    a. True
  3. Environmental conditions that allow conditional lethals to live are known as ____ conditions.



    D. permissive
  4. Which of the following ratios show incomplete dominance?




    C. 1:2:1
  5. Monohybrid crosses helped reveal the Law of Independent Assortment.
    a. True
    b. False
    b. False
  6. The oldest known living organism on the planet are the




    D. prokaryotes
  7. The ____ is a Mendelian law that states that both alleles must separate during gamete formation.



    D. Law of Segregation
  8. What aspects of chromosome behavior most clearly accounts for Mendel's law of segregation?




    C. movement of homologous chromosomes to opposite poles at anaphase I of meiosis
  9. What does a diamond symbol (<>) on a pedigree chart indicate?



    C. unspecified gender
  10. An interaction between non-allelic genes that result in the masking of expression of a phenotype




    A. epistasis
  11. A person who has type O blood has



    D. both anti-A and anti-B antibodies
  12. The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is




    A. prophase
  13. During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?
    a. G1
    2. G2
    c. mitotic prophase
    d. mitotis metaphase
    e. All of the above
    a. G1
  14. An allele that expresses its phenotype even when heterozygous with a recessive allele is termed




    C. dominant
  15. At which of the following stages of meiosis would homologous chromosomes be paired?




    E. both prophase and metaphase of meiosis I
  16. _____ is the process in which both egg and pollen come from the same plant.



    D. self-fertilization
  17. Currently, the estimated number of genes in the human genome is




    C. 20,000 to 30,000
  18. In some genetically enginerred corn plants the dominant gene (BT) produces a protein that is lethal to certain flying insect pests that eat the corn plants. It was also found that the pollen could cause death in some flying insects. If the corn plant is heterozygous for BT, what proportion of the pollen would carry the dominant gene?




    B. 1/2
  19. In a monohybrid cross between an organism that is homozygous dominant and an organism that is homozygous recessive, what proportion of heterozygotes is expected among the F2 offspring?




    A. 1/2
  20. Cross-fertilization is the same as reciprocal cross.
    a. True
    b. False
    b. False
  21. In which condition is neither gene fully expressed?



    C. incomplete dominance
  22. The first offspring from the parents are called




    C. F1
  23. In Drosophila virilis, nuclei of somatic cells contain 12 chromosomes while nuclei of sperm cells contain only 6 chromosomes. What does "n" equal for this species?




    E. 6
  24. Which of the following ratios indicates a recessive lethal gene?




    A. 2:1
  25. The snapdragon flower colors white, pink, and red indicate codominant inheritance.
    a. True
    b. False
    b. False
  26. During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?




    A. G1
  27. An individual can be a heterozygote for one trait and a homozygote for another.
    a. True
    b. False
    a. True
  28. Blood type "AB" is an example of



    B. codominance
  29. In codominance, F1 hybrids show the traits of both parents.
    a. True
    b. False
    a. True
  30. Which aspects of chromosome behavior is/are primarrily responsible for the tremendous amount of genetic variability associated with sexual reproduction?




    E. both crossing over between homologous chromosomes during prophase I of meiosis and independent alignment of different homologous pairs on the metaphase I spindle contribute to genetic variability
  31. Which of the following was probably the first genetic material on earth?




    D. RNA
  32. A _____ is a cross between an unknown and a homozygous recessive.




    B. testcross
  33. Cells in the G2 stage of the cell cycle have ____ as cells of the same species in the G1 stage.




    E. twice as many chromatids
  34. _____,_____, and ____ were all involved in the rediscovery of Mendel's research.



    C. Erich von Tschermak, Carl Correns, and Hugo de Vries
  35. A YY or yy genotype is called heterozygous.
    a. True
    b. False
    b. False
  36. When a late blooming pea and an early blooming pea are crossed and an intermediate phenotype occurs, this result would suggest incomplete dominant inheritance.
    a. True
    b. False
    a. True
  37. Mitosis results in ____ chromosome number, whereas meiosis results in _____ chromosome number.




    D. no change in, a reduction by half in
  38. An alternative form of a single gene is known as




    D. allele
  39. A rare recessive trait in a pedigree is indicated by which pattern of inheritance?




    B. horizontal
  40. What aspect of chromosome behavior most clearly accounts for Mendel's law of independent assortment?




    A. crossing over between homologous chromosomes during prophase I of meiosis
  41. Duplications of the genes, followed by mutation, is responsible for the formation of




    D. gene families
  42. A zygotes is a fertilized egg.
    a. True
    b. False
Author
kingbken
ID
124063
Card Set
Genetics test 1 real
Description
Genetics test 1 real
Updated