Draw two cells: one showing the arrangement of chromosomes at metaphase of mitosis, and the other
showing the chromosomes at metaphase I of meiosis. What is the significance of this difference? What will be an ideal response?
The drawing should resemble Fig. 10-9a (for mitosis) and the Metaphase I drawing on p.229 (for
meiosis). In mitosis, the homologous chromosomes line up singly on the cell’s midplane whereas in
meiosis the homologous chromosomes line up as pairs. This arrangement in meiosis is a necessary
preparation for the following stage (anaphase I) in which the homologous pairs separate, thus leading
to the halving of chromosome number in the daughter cells.
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Self-incompatibility in flowering plants is a biochemical recognition and rejection process that prevents ____
a. both self-fertilization and self-pollination b. self-pollination and occasionally prevents self-fertilization c. self-fertilization but not self-pollination d. self-pollination but not self-fertilization e. self-fertilization and occasionally prevents self-pollination
A gene in a sheep-like species has been found to differ from that in related species by the inclusion of a variable number of tandem repeats of a short sequence. These repeats or duplications arise from what process?
What will be an ideal response?
Using what you have learned in this chapter, explain how you would decide whether multivitamins are beneficial to dogs
What will be an ideal response?
The sexually transmitted invasive form of chlamydia
A. never infects the baby of an infected mother during birth. B. is symptomatic in 85% of infected females. C. is caused by the LGV strain of Chlamydia trachomatis. D. is easily differentiated from gonorrhea. E. does not recur because of the immune response the host produces against reinfection.