Sex in Vertebrates several fish species can change sex during an individual's life O is necessary for reproduction O males are always dominant over females O is fixed during embryonic development O environmental hormones have no impact on sex determination and characteristics

Sex in Vertebrates several fish species can change sex during an individual's life O is necessary for reproduction O males are always dominant over females O is fixed during embryonic development O environmental hormones have no impact on sex determination and characteristics

Name: Question 25Sex in Vertebratesseveral fish species can change sex duri
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Description: Question 25Sex in Vertebratesseveral fish species can change sex during an individual's lifeO is necessary for reproductionO males are always dominant over femalesO is fixed during embryonic developmentO environmental hormones have no impact on sex

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter8: How Cells Reproduce

Section: Chapter Questions

Problem 7SQ

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How Is Sex Determined? The absence of a Y chromosome in an early embryo causes the: a. embryonic testis to become an ovary b. Wolffian duct system to develop c. Mllerian duct system to degenerate d. indifferent gonad to become an ovary e. indifferent gonad to become a testis
Secondary sexual characteristics or sexual often result from sexual selection? O dichotomy O hermaphrodites O monogamy O dimorphism A Moving to another question will save this response. esc
A study divides healthy females into two groups (A and B). Both groupsare composed of those who have been sexually active for at least 2 yearsand are not pregnant at the beginning of the experiment. The subjectsweigh about the same amount, and none smoke cigarettes, althoughsome drink alcohol occasionally. Group A individuals receive a placeboin the form of a sugar pill each morning of their menstrual cycles. GroupB individuals receive a pill containing estrogen and progesterone eachmorning of their menstrual cycles. Then plasma LH levels are measuredbefore, during, and after ovulation. The results are as follows:Group 4 Days BeforeOvulationDay ofOvulation4 Days AfterOvulationA 18 mg/100 mL 300 mg/100 mL 17 mg/100 mLB 21 mg/100 mL 157 mg/100 mL 15 mg/100 mLThe number of pregnancies in group A is 37/100 females/year. Thenumber of pregnancies in group B is 1.5/100 females/year. Whatconclusion can you reach on the basis of these data? Explain themechanism involved.
I H esc 片 F QUESTION 17 What is neurulation? O a. The process by which structures become complex and functionally specialized during development O b. The process by which the neural plate becomes the neural tube O c. The process of formation of a groove in the neural plate that runs rostral to caudal O d. The process by which neural ectoderm is pinched off and lies lateral to the neural tube QUESTION 18 Which major fiber bundle connects the two cerebral hemispheres? O a. Optic chiasm Ob. Longitudinal cerebral fissure Oc. Corpus callosum O d. Fornix QUESTION 19 Identify the similarity between sweet receptors and bitter receptors. Choose the correct option. Click Save and Submit to save and submit. Click Save All Answers to save all answers. ! Type here to search f1 ? Q f2 (6) @ 2 * W # 3 E f4 $ LA O IOI 4 f5 % R 5 T 17 4- & 7 Y 6 U 4 19
Question 27 Which of these CANNOT cause male infertility? O Very low testosterone O Removal of the testes O Circumcision of penis O Blockage of epididymis O Blockage of vas deferens
Question 62 A normal human gestation lasts for how long? O 266 days from ovulation O 280 days from ovulation O 18 months altogether O 200 days after coitus O 10 months from last menses
D Question 1 Which of the following is an advantage of sexual reproduction over asexual reproduction? has a lower mutation rate passes along a higher portion of each parent's genome usually produces more offspring results in greater genetic diversity in offspring Question 2 Which of the following is the correct order of structures through which sperm pass during an ejac O urethra, epididymis, vas deferens, ejaculatory duct seminiferous tubules vas deferens epididymis urethra
QUESTION 5 What event would most directly lead to the development of female external genitalia? Absence of the SRY gene Absence of high levels of androgens Presence of 2 X chromosomes Presence of high levels of estrogens O O O O
About sexual reproduction: Involves one parent where a new individual develops being an exact copy of the parent also known as clone and no gamete or reproductive organ is involved O Only the mother contributes with the oocyte or egg where a new individual is formed with an exact copy of the mother's genes O Involves two parents, where each parent contributes with special germ cells or gametes that once united in fertilization, a new individual develops receiving genetic material from both parents and the product of gene recombination O Involves the father only which contributes with special germ cells or spermatozoa that once fertilized, a new individual develops receiving genetic material from the father and the product of gene recombination Next » « Previous
QUESTION 3 Which of the following statements is true regardng neurulation? The notocord is formed from ectoderm The notochors is present throughout development and disappears after birth The notochord produces signals that induce neural plate formation The notochord produces signals that induce neural tube formation
Question 7 osis II after fertilization. Which of the following changes is most likely to occur as an immediate result of an injection of LH into a male mammal? O an increase in production of GnRH a decrease in production of testosterone O an increase in production of testosterone O a decrease in production of inhibin Question 8 Which option correctly lists, in chronological order, the three phases of the human ovarian cycle? O follicular phase → ovulation → luteal phase menstruation → proliferative phase → secretory phase phore → secretory phase
QUESTION 3 What causes the Wolffian duct to develop into male reproductive structures? This will happen in the absence of anti-Wolffian hormone This will happen in the absence of estrogens This will happen in the presence of high levels of androgens This is the default pathway