NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE An Unusual Case of Animal Reproduction by Joann B. Powell Department of Biological Sciences Clark Atlanta University, Atlanta, GA Elethia W. Tillman Department of Biology Spelman College, Atlanta, GA Part I – Andrea Smith’s Dilemma Andrea Smith was taking notes for her biology exam. Her professor has told her that the exam would cover, in part, the differences between sexual and asexual reproduction. As she reviewed her notes and prepared for today’s class, she was thinking about her own reproductive dilemma. If only asexual reproduction were the case for humans, maybe she wouldn’t be in this mess. Or at least there wouldn’t be questions about who was the father of her twins. “Dwelling …show more content…
In some ways she was dreading it; but she was determined to prove what she believed she had known all along: That Xavier was the father of her twins. Questions 1. 2. 3. 4. 5. What is the difference between asexual and sexual reproduction? List and define some types of asexual reproduction. Give one example of each. What is the difference between parthenogenesis and hermaphroditism? What is the difference between internal and external fertilization? What is the function of pheromones? “An Unusual Case of Animal Reproduction” by Powell and Tillman Page 2 NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE Part II – The Pregnancy “I can’t believe it has come to this! Airing our dirty laundry on national television. I never thought Xavier would let things get so out of hand.” It was late and Andrea was so upset she couldn’t sleep. She tried studying for the upcoming exam, but she couldn’t concentrate. She decided to get an early start on packing. She was so angry with Xavier. How could he have left her pregnant and alone, she thought, as she neatly added her new dress to the bag? How could he think that their babies might belong to someone else? She grabbed her journal, about to add it to the bag, but instead sat in her cozy corner chair and began to read: January 12, 2007 I’m pregnant with twins! Sometimes it’s still hard to believe because it was so unexpected. I feel like I am about to pop! I know
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Christy chose this industry from listening to her inner voice and needs. She devoted herself to her career and passed the peak time of fertility. She was trying to find a way to balance having a career and a family. Reading of Hewlett’s book and discussion with Christy’s friends about fertility treatment inspired Christy brought her interest in digging in the fertility industry. At that time, some medical research center started to offer freezing egg services to cancer patient before chemotherapy. Christy thought this technology could benefit professional women who often delay on serious relationships,
to let curiosity get to the best of her, it was her fault because she
thinking about the inside state of her marriage... She fought back... but it didn't do her any good...
Charlene Forest is an associate professor in the Biology department at Brooklyn College, who dedicates her research in to trying to understand the mechanism behind the process of fertilization in algae, as well as what controls expression of gamete-specific genes. To do so, she must understand how sperm and egg gametes first recognize and then fuse with each other. Thus, in order to find what causes the fusion of these gametes, Forest’s lab is cloning genes that prevent the fusion of sperm and egg gametes. She hopes that her research on the fertilization process in algae will help understand the fertilization process in other organisms, particularly humans.
Olivia Judson, an evolutionary biologist with a doctorate in biological sciences and the author of The Definitive Guide to the Evolutionary Biology of Sex: Dr. Tatiana's Sex Advice to All Creation tells of her in-depth research on procreation to educate others on the sex life of all creation while incorporating the organismsf scientific names. Each chapter of the book begins with letters containing questions from an animal, amphibian, bug, arachnid, or other organism that, at times, must be put under a magnifying glass to see. The questions themselves are under three different categories. These categories are as follows:
D) Sexual reproduction is more likely to increase genetic variation than is asexual reproduction. E) Only asexual
Dr. Tatiana’s Sex Advice to All Creation, written by Olivia Judson, mimics a Dear Abby column in a newspaper, in which her audience, ranges from a honeybee to spotted hyena, write-in and ask for help with their sex lives. She covers a slew of different sex topics, some more pleasant than others, such as incest, cannibalism, promiscuousness, and asexual reproduction. The book is truly a witty yet entertaining excursion of the natural history and the evolutionary biology of sex. Judson’s objective is to teach her audience about biology, specifically sexual biology.
In contrast, when two individuals mate, the cells go through cell division or meiosis. This allows four daughter cells to produce from the original first cell. Since the offspring has genes and traits from both parents, the offspring will be unique. This is advantageous for evolutionary changes. Since each offspring is unique in their genetic material, some won’t be affected by a disease, such as HIV, AIDS, and viruses, as others might. This allows these offspring to survive. The
She wanted to be some person’s number one. She wanted the fierce, unconditional devotion that she had witnessed in the little moments between May and Coulson. She wanted the near co-dependency, needy bond that Fitzsimmons had. She wanted the inescapable and maddening love that Bobbi and Hunter shared. She had no one like that, and it made her feel like an outsider sometimes. That was the problem with being a unwanted foster kid, you never got over be the unwanted
Martin, after careful consideration and researching in unique methods, comes to an overall conclusion that there are cultural influences in the way egg and sperm interactions are presented in textbooks. This conclusion has many serious
Do you know how you were born? Do you know how you came to be? The reproductive system is the system that made that all possible. Without the reproductive system you wouldn’t have been born. In order to produce offspring, the male and female reproductive systems have to be different. Each system has different parts, problems and care. Each system have different purposes, the male reproductive system’s function is to produce sperm, while the female reproductive system’s function is to produce ova, store ova and house a fertilized egg.