Internal and external fertilization both ……… occur only among birds. produce single-celled zygotes. depend on the use of intromittent copulatory organs. occur only among terrestrial animals. occur only among invertebrates.
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- 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 cWhat is NOT a disadvantage of internal fertilization? the ability to reproduce on land without needing external water the need for more specialized reproductive structures the production of fewer embryos the reduction in the randomness of fertilization (less genetic variability in offspring)Which of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky cytoplasm to squeeze into animal pole Meiosis II completes Occurs before albumen and shell are secreted to cover the egg Cortical rotation Centrally located yolk confines cleavage to cytoplasmic rim of egg
- From a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenEndoderm Mesoderm Ectoderm Match the structures below with the correct germ layers listed above that they are formed from. Number: Answer Answer Answer Answer Tissues and Organs: Central Nervous System Lining of the Digestive Tract Skin SkeletonIn sea urchin, which step of egg and sperm recognition involves the formation of a fertilization cone? Sperm binding to the egg's vitelline membrane Fusion of the sperm and egg membranes Acrosomal reaction Chemo-attraction Sperm binding to the egg's jelly coat
- If activity of the organizer is inhibited, what does the embryo become? A mass of notochord. A mass of mesoderm. A mass of ventral tissue. A fully formed embryo.Diagram out the process of fertilization in the sea urchin. Be sure to include and end with the event of fast and slow block of polyspermy. What would be good short few sentence descriptions of each step?How do different types of energy investment by females contribute to the reproductive success of a frog, a chicken, and human? Drag the appropriate items to their respective bins. Reset Help embryos have gelatinous coat and lack internal membranes internal fertilization external fertilization embryos have internal membrane invest energy to the protection of their embryos by strong shells invest energy to the gamete production invest energy to the protection of their embryos by internal development Frog Chicken Human
- Which of the following groups include at least some members that exhibit internal fertilization? Choose all that apply. O Amphibians O Reptiles Birds MammalsAll of the following are requirements for successful external fertilization except for one. Which one is not a requirement? A moist environment. Large, energy-rich gametes. Synchronization of gamete release. Lock and key recognition between gametes of the same species.Egg laying in fruit flies can be triggered (induced) when males transfer their sperm to females. Which of the following is a selective advantage of induced egg laying for the male flies? Less time and energy is expended by the male. The males do not have to produce as much sperm. More eggs can be fertilized. A male fly's sperm is more likely to be used for fertilization. Submit Request Answer
