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How can one cell give rise to different types of cells? Support your explanation with embryologic evidences.
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: How can one cell give rise to different types of cells? Support your explanation with embryologic evidences
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- Which mechanism prevents an ovum from being fertilized by multiple sperm cells? Select one: a. When more than a single sperm cell fuses with the plasma membrane, multiple zygotes can form, leading to the conception of twins or triplets. b. When a sperm fuses with the plasma membrane of the egg, depolarization of the membrane occurs. c. Once a sperm penetrates the jelly-like coating of the egg, no other sperm cells can penetrate the coating. d. The egg can only survive in the Fallopian tube for 24 hours as it does not have mitochondria to produce energy.List and briefly describe the four stages that are thoughtto have led to the formation of the first cells.In your own words: If cell division during gametogenesis were non-meiotic, what would be its consequence for future generations of diploid organisms? Expound.
- How does a fertilized egg give rise to an organism with highly differentiated cells that are organized in space and time?Is it possible that an unfertilized apomictic embryo sac gives rise to a diploid embryo? Give a reason in support of your answer.What two things must occur for a new cell to be produced?
- From what you know about embryonic development, do you think that a cell from the inner cell mass or one from the ectoderm has more developmental potential?In your own words,briefly describe the process of mitosis and differentiation.Howw many different cell types would you find at the embryonic stages (cleavage, blastocyst, the stage in the embryonic period that shows "a tube within a Tube"
- Cell differentiation occurs through _______________, whereas morphogenesis involves _______________. (a) pattern formation; cell determination (b) cell division; cell expansion (c) cell expansion; pattern formation (d) cell determination; cell division (e) cell determination; pattern formationOrder 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 pellucidaWhich of the following are characteristics of stem cells? Select all that apply. --They can divide via meiosis to produce additional stem cells. --They are unspecialized cells. --They are specialized cells. --They differentiate into specialized cell types via homeotic genes. --They can divide via mitosis to produce additional stem cells.
