HOMEWORK ASSIGNMENT 4

BIOLOGY1361
HOMEWORK ASSIGNMENT 4

Review Exercises / Critical Thinking problems

Chapter 23: (1 – 23) on page 662

1. Explain what occurs between the time of ovulation and the implantation of the fertilized in the uterus.
2. Explain the function of the chorion and placenta.
3. Name the three primary germ layers, and name three structures that develop from each layer.
4. Define histogenesis and organogenesis.
5. Describe and give the approximate length of each of the three stages of labor.
6. What is the difference between identical and fraternal twins?
7. What is an ectopic pregnancy? Where is it most like to occur?
8. What is placenta previa. What ia abruptio placentae?
9. What’s preeclampsia?
10. What is a teratogen?
11. What is the stiumulus for a baby’s first breath?
12. Name three developmental changes that occur during infancy.
13. Briefly explain what biological developments occur during childhood.
14. Briefly explain what biological developments occur during adolescence.
15. Briefly explain what biological developments occur during adulthood.
16. What is progeria?
17. Explain the effects of again on the skeletal system.
18. Explain the effects of again on the respiratory system.
19. Explain the effects of again on the cardiovascular system.
20. Explain the effects of again on vision.
21. Where do the nutrients used by the zygote between the time of fertilization and implantation come from?
22. Explain the evolution of the function of the yolk sac.
23. What hormones are produced by the placenta? What is their function?


Chapter 24: (1-17) on page 684

1. Explain how the DNA code is able to regulate the biochemistry of the cell.
2. As they are used in this chapter, define chromosome and gene.
3. What is meant by independent assortment?
4. Define or explain the terms dominant, recessive, and codominant in regards to genetics.
5. What is a sex-linked trait?
6. Define or explain the terms nondisjunction, trisomy, and monosomy.
7. What’s a pedigree chart?
8. What is a Punnett square?
9. What is a karyotype? What are the two methods used to harvest cells for a karyotype?
10. Explain the difference between gene augmentation and gene replacement therapy.
11. Name and briefly describe the two single-gene diseases discussed in this chapter.
12. Name and briefly describe the three chromosomal diseases discussed in this chapter. Indicate whether the diseases are the result of the trisomy or monosomy.
13. Explain why the particular sperm that fertilizes the egg determine she sex of the offspring.
14. What is crossing-over? How does this process add to generic variation?
15. Explain why men have more six-linked disorders than women.
16. Which type of genetic mutation has the greatest long-term impact on the population? Harmful or beneficial? Explain your answer.
17. If parents are concern that their child might be born with Down syndrome, what would be the best way to determine this: a pedigree, a Punnett square, or karyotype? Explain your answer.

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