Which of the following steps of sea urchin fertilization initiates the formation of the fertilization envelope? A Acrosomal reaction Fast block to polyspermy Egg activation D Cortical reaction Chemo-attraction
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- In 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 coatWhich 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 eggAll 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.
- The route followed by a sperm from production to fertilization in a flowering plant is: -A sperm cell, enclosed in a pollen grain with another sperm, is produced in the filamentIt is transported to a stigma where it passes through a pollen tube that grows down the style to the ovaryThe pollen grain enters the ovule and joins with the egg cell. -A sperm cell is produced in the antherIt is transported to a stigma where it becomes enclosed along with another sperm cell into a pollen grainThe pollen grain grows down the style to the ovaryIt enters the ovule and joins with the egg cell. -A pollen grain is produced in the pistil, which explosively ejects it into the airThe pollen grain is transported to a stigma where it forms two sperm cells.One of the sperm cells passes through a pollen tube that grows down the style to the ovaryThe sperm enters the ovule and joins with the egg cell. -A pollen grain is produced in the antherIt is transported to a stigma where it produces two sperm…What process is occuring indicated by the letter A Name the strcuture indicated by the letter B Name the strcuture indicated by the letter C What process is occuring between zygote to embryo stage indicated by the letter D? What process indicated by letter E is occuring that result in the plant zygote? What strcuture is in the circle indicated by the letter F? What word is used to describe the strcuture indicated by the letter G? What are those small strcutures that are settling on this flower part indicated by the letter H.A sperm encounters an egg's jelly coat thus triggering the acrosomal reaction. What is the first step of this reaction (i.e., what happens next)? The acrosome binds to the receptor on the ovum allowing the head to enter the ovum. The midpiece releases enzymes that cause the acrosome, along with the head, to separate from the flagellum and enter the egg. The acrosome releases enzymes that break down the jelly coat. The ovum releases calcium which then capacitates the acrosome.
- 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?What 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)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
- In fertilization, select answer a male gamete and a female gamete two female gametes two male gametes fuse to produce a select answer zygote female germ cell male germ cellWhich of the following does NOT aid the sperm in fertilization? * Increased mitochondria Cytoplasmic bridge Acrosomes Flagellum development Hyaluronidase & proteaseWhy is it necessary for the egg to have changes leading to polyspermy blockduring fertilization?
