Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Textbook Question
Chapter 41, Problem 2CT
Fraternal twins are nonidentical siblings that form when two eggs nature are released, and are fertilized at die same time. Explain why an unusually high level of FSH raises the likelihood of fraternal twins.
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Chapter 41 Solutions
Biology: The Unity and Diversity of Life
Ch. 41 - Stuck Sperm Cells lining the epididymis secrete a...Ch. 41 - Prob. 2DAACh. 41 - Prob. 3DAACh. 41 - Prob. 4DAACh. 41 - Sexual reproduction ___ . a. requires formation of...Ch. 41 - The ___ is a genetic dead end. a. polar body b....Ch. 41 - Prob. 3SQCh. 41 - Prob. 4SQCh. 41 - During a menstrual cycle, a midcycle surge of...Ch. 41 - Prob. 6SQ
Ch. 41 - Prob. 7SQCh. 41 - Male germ cells divide by meiosis inside the...Ch. 41 - A male attains an erection when ___ . a. muscles...Ch. 41 - Prob. 10SQCh. 41 - Prob. 11SQCh. 41 - Prob. 12SQCh. 41 - Match each disease with the type of organism that...Ch. 41 - Match each structure with its description. ____...Ch. 41 - Match each hormone with its source. ____ FSH and...Ch. 41 - Prob. 1CTCh. 41 - Fraternal twins are nonidentical siblings that...Ch. 41 - Some sperm mitochondria enter an egg during...Ch. 41 - Occasionally more than one sperm penetrates and...
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- Explain about double fertilisation.arrow_forwardInfertility strikes both men and women. Describe in a summary the biological causes that impair the process of conception in both males and females. Besides mentioning specific reasons of infertility in males and females, you need to include in your answer other cause(s) that might be the result of a combination of factors originating from both men and women.arrow_forwardAccording to the graph below, estrogen will reach its peak concentration prior to ovulation. Predict the concentration of the other hormones by choosing low, medium, or higharrow_forward
- multiple births are observed commonly in women treated for infertility with drugs that stimulate the release of gonadotropic hormones. what could be the reason?arrow_forwardExplain the term double fertilisation.arrow_forwardwhen a woman is injected with an egg fertilized in vitro, the probability of its implanting is 20 percent. If a woman is injected with five eggs simultaneously, what is the probability that she will become pregnant?arrow_forward
- Please answer this question.arrow_forwardWhatever the mechanisms, it has been estimated that 25–30% of human neural tube birth defects can be prevented if pregnant women take supplemental folate.arrow_forwardThe change of successful fertilization is approximately 18% in every cycle. Why does this statistic seem so low? All of the following statements provide a reason as to why the chance of fertilization is 18% every ovarian cycle EXEPT Select one: A. Some Sperm cells are not very motile, while others are formed without a tail. B. If more than one sperm fertilizes an egg, multiple embryos can result. C. Vagina is very acidic, killing many sperm. D. There two fallopian tubes and two ovaries, but only one of them releases an ovum every cycle.arrow_forward
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