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You are studying reproduction in starfish (also known as sea stars). You are able to successfully extract sperm and eggs from individuals in the lab and artificially fertilize the eggs. What is the first thing you expect to see in the zygote/embryo after successful fertilization?
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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 spermWhich of the following does not occur during cleavage?A. Rapid DNA synthesisB. Cell growthC. Differential distribution of nutrients and information moleculesD. A rapid series of cell divisionsE. Formation of the blastulaYou are studying reproduction in starfish (also known as sea stars). You are able to successfully extract sperm and eggs from individuals in the lab and artificially fertilize the eggs. What is the second thing you expect to see (from this list) in the zygote/embryo after successful fertilization? Group of answer choices A. development of a barrier against sperm entry B. rapid cell division without growth C. rapid growth and cell division D. development of organs
- Which of the following does NOT aid the sperm in fertilization? * Increased mitochondria Cytoplasmic bridge Acrosomes Flagellum development Hyaluronidase & proteaseThe chart above shows the structures and processes that form the extra-embryonic and embryonic membranes. Place the number in the blank that corresponds to the correct membrane that forms the system, or the structure that is formed by the membrane. Record the answers in the box in the same order as you entered the numbers from top to bottom. ____ Endoderm ____ Ectoderm ____ Umbilical Cord ____ Chorion ____ Circulatory System ___________After the sperm cells enter a synergid, one fertilizes the egg in a two-step process. First there is fusion of the sperm cell’s protoplasm with that of the egg, a step called ______________________________. Then the sperm cell nucleus fuses with the egg cell nucleus, the second step, called _____________________________.
- evel Basic Features of Reproduction Which of the following features does not differentiate asexual reproduction from sexual reproduction? Asexual reproduction involves a single parent but it is not the case in sexual reproduction. Sexual reproduction does not involve gamete formation but asexual reproduction does. Asexual reproduction does not involve mitosis while sexual reproduction does. I. II. III. (a) I and II (b) II and III (c) I and III (d) I, II and IIIOrder the events leading to the sperm's nucleus fusing with the egg's nucleus. Question 1 options: sperm's nucleus is released into the egg's cytoplasm sperm burrows through the orona radiata sperm's nucleus and egg's nucleus fuse sperm's cell memrbane fuses with egg's cell membrane sperm's acrosome enzymes burrows through the zona pellucida the zona pellucida changes so that any new sperm's acrosome cannot burrow through the zona pellucidaComplete the steps in sexual reproduction on animal and plants by arranging the words on the diagram.A. Animal sexual reproductionEgg cell Embryo Fetus Fertilized egg Fertilization Sperm cell ZygoteB. Plant sexual reproductionEmbryo Fertilized egg Fertilization Fruit/Seed OvumPollen Pollination Zygote
- Select ALL of the following that occur during spermiogenesis: Microtubules form a flagellum The nucleus condenses O Proteolytic (digestive) enzymes are bundled in an acrosomal cap Excess cytoplasm is shedCompare asexual and sexual reproduction. Cite the advantages and disadvantages of each type of reproduction. Brief answer onlyIdentify each of these statements as ones that describe asexual reproduction (A),sexual reproduction (S), or could describe both (B) forms of reproduction. Writeyour answer on the space provided before each number.B= BothA= Asexual ReproductionS= Sexual Reproduction1. organism does not need a mate to reproduce2. takes some time to create offspring-3. the offspring are not the exact copy of their parent/s4. it is a quick process5. does not need to develop special cells for reproduction6. environmental changes affect all individuals-7. may only be able to reproduce with a limited number or may notreproduce at all_8. offspring are reproduced9. characteristics are passed down to the next generation10. many new organisms are created in a short period of time11. dogs and cats reproduce this way12. amoeba, yeast and bacteria reproduce this way.13. plants reproduce this way14. production of gametes is necessary15. its purpose is the survival and continuity of species
