Why is the frog pattern of cleavage different from the sea urchin pattern of cleavage? Group of answer choices A. the frog cells all divide at the same rate and are all the same size B. the frog vegetal pole cells divide more slowly and are large and yolk-filled C. the frog vegetal pole cells divide more slowly and are small D. the yolk does not divide in the frog E. the blastopore forms the mouth

Why is the frog pattern of cleavage different from the sea urchin pattern of cleavage? Group of answer choices A. the frog cells all divide at the same rate and are all the same size B. the frog vegetal pole cells divide more slowly and are large and yolk-filled C. the frog vegetal pole cells divide more slowly and are small D. the yolk does not divide in the frog E. the blastopore forms the mouth

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter16: Reproductive Systems

Section: Chapter Questions

Problem 8SQ: Fertilization _____. a. unites the nuclei of a sperm and egg cell b. forms a zygote that has...

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Which of the following will result in identical twins?a. fertilization of two eggs by two different spermb. division of a zygote into two masses before differentiation has begunc. fertilization of two eggs by the same spermd. fertilization of one egg by two different sperm
Birth Defects and Multiple Births A woman who carries multiple offspring at the same time increases the risk of some birth defects. FIGURE 42.18 shows the results of Yiwei Tang's study of birth defects reported in Florida from 1W6 to 2000. Tang compared the incidence of various defects among single and multiple births. She calculated the relative risk for each type of defect based on type of birth, and corrected for other differences that might increase risk such as maternal age, income, race, and medical care during pregnancy. A relative risk of less than 1 means that multiple births pose less risk of that defect occurring. A relative risk greater than 1 means multiples are more likely to have a defect. FIGURE 42.18 Prevalence, per 10,000 live births, of various types of birth defects among multiple aria single births. Relative risk for each defect is given after researches adjusted for the motor's age, race, previous adverse pregnancy experience, education, Medicaid participation during pregnancy, as well as the infant's sex and number of siblings. 4. Does a multiple pregnancy increase the relative risk of chromosomal defects in offspring?
Fertilization _____. a. unites the nuclei of a sperm and egg cell b. forms a zygote that has chromosomes of both parents c. usually occurs in an oviduct d. all of the above e. a and b but not c
Fill in the blank: A human offspring is called a(an) ___________________ until the end of the eighth week of development.
A: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?
The..........is a hollow ball of cells that develops from the morula. a) Blastocyst b) Oviduct c) Ovary d) Chorion
Fill in the blank: The meiosis of egg formation is called _______________________.
Cells at the 4 cell stage of an embryo are _______ compared to cells at the 32 cell stage of the same embryo? Group of answer choices A. larger B. smaller and more differentiated C. about the same size D. smaller E. smaller and less differentiated
Which of the following is not true about frogs eggs and blastula formation? Choose all possible answers a. denser yolk in the animal hemisphere. b. Cleavage is holoblastic c. first cleavage plane is meridional and bisects the gray crescent, revealing the existence of some factor(s) that determine(s) the initial orientation of the cleavage spindle. d. first furrow also marks the plane of bilateral symmetry in the body e. All four blastomeres differ in sizes. f. All of the following are true about eggs of frogs.
Choose the best of the following The identity of each segment of a developing embryo is controlledby:a. fate mapsb. gray crescentc. homeotic genesd. the blastocyste. None of these are correct.
Which of these is mismatched?a. chorion—sense perceptionb. yolk sac—fi rst site of blood cell formationc. allantois—umbilical blood vesselsd. amnion—contains fl uid that protects embryo