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The Physical Basis of Heredity Practice Test (page 2)

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By — McGraw-Hill Professional
Updated on Aug 19, 2011

Problems

  1. There are 40 chromosomes in somatic cells of the house mouse. (a) How many chromosomes does a mouse receive from its father? (b) Howmany autosomes are present in a mouse gamete? (c) Howmany sex chromosomes are there in a mouse ovum? (d) How many autosomes are there in somatic cells of a female?
  2. Identify the mitotic stage represented in each of the following diagrams of isolated cells from an individual with a diploid chromosome complement of one metacentric pair and one acrocentric pair of chromosomes.
  3. The Physical Basis of Heredity Supplementary Problems

  4. Identify the meiotic stage represented in each of the following diagrams of isolated cells from the germ line of an individual with one acrocentric pair and one metacentric pair of chromosomes.
  5. The Physical Basis of Heredity Supplementary Problems

  6. How many different types of gametic chromosomal combinations (paternal vs. maternal) can be formed in the garden pea (2n = 14)? (Hint: See Solved Problem 1.1.)
  7. What animal cells correspond to the three megaspores that degenerate following meiosis in plants?
  8. What plant cell corresponds functionally to the primary spermatocyte?
  9. What is the probability of a sperm cell of a man (n = 23) containing only replicas of the centromeres that were received from his mother? (Hint: See Solved Problem 1.1.)
  10. How many chromosomes of humans (2n = 46) will be found in (a) a secondary spermatocyte, (b) a spermatid, (c) a spermatozoan, (d) a spermatogonium, (e) a primary spermatocyte?
  11. Howmany human egg cells (ova) are produced by (a) an oogonium, (b) a primary oocyte, (c) an ootid, (d) a polar body?
  12. Corn (Zea mays) has a diploid number of 20. How many chromosomes would be expected in (a) a meiotic product (microspore or megaspore), (b) the cell resulting from the first nuclear division (karyokinesis) of a megaspore, (c) a polar nucleus, (d) a sperm nucleus, (e) a microspore mother cell, (f) a leaf cell, (g) a mature embryo sac (after degeneration of nonfunctional nuclei), (h) an egg nucleus, (i) an endosperm cell, (j) a cell of the embryo, (k) a cell of the pericarp, (l) an aleurone cell?
  13. A pollen grain of corn with nuclei labeled A, B, and C fertilized an embryo sac with nuclei labeled D, E, F, G, H, I, J, and K as shown below.
  14. The Physical Basis of Heredity Supplementary Problems

    1. Which of the following five combinations could be found in the embryo: (1) ABC (2) BCI (3) GHC (4) AI (5) CI?
    2. Which of the above five combinations could be found in the aleurone layer of the seed?
    3. Which of the above five combinations could be found in the germinating pollen tube?
    4. Which of the nuclei, if any, in the pollen grain would contain genetically identical sets of chromosomes?
    5. Which of the nuclei in the embryo sac would be chromosomally and genetically equivalent?
    6. Which of the nuclei in these two gametophytes will have no descendants in the mature seed?
  15. A certain plant has eight chromosomes in its root cells: a long metacentric pair, a short metacentric pair, a long telocentric pair, and a short telocentric pair. If this plant fertilizes itself (self-pollination), what proportion of the offspring would be expected to have (a) four pairs of telocentric chromosomes, (b) one telocentric pair and three metacentric pairs of chromosomes, (c) two metacentric and two telocentric pairs of chromosomes?
  16. For Problems 1.17 and 1.18, diagram the designated stages of gametogenesis in a diploid organism that has one pair of metacentric and one pair of acrocentric chromosomes. Label each of the chromatids assuming that the locus of gene A is on the metacentric pair (one of which carries the A allele and its homologue carries the a allele) and that the locus of gene B is on the acrocentric chromosome pair (one of which carries the B allele and its homologue carries the b allele).

  17. Oogenesis: (a) first metaphase; (b) first telophase resulting from part (a); (c) second metaphase resulting from part (b); (d) second telophase resulting from part (c).
  18. Spermatogenesis: (a) anaphase of a dividing spermatogonium, (b) anaphase of a dividing primary spermatocyte, (c) anaphase of a secondary spermatocyte derived from part (b), (d) four sperm cells resulting from part (b).
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