Imagine how you came to be. Out of thousands of eggs and millions of sperm‚ one egg and one sperm united to produce you. Had the union of sperm and egg come a day or even a month earlier or later‚ you might have been every different‚ maybe the opposite sex or with blonde hair of longer legs. Conception occurs when a single sperm cell from the male unites with an ovum (egg) in the females’ fallopian tube in process call fertilization. The fertilized egg is called a zygote. By the time the zygote ends
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second trend is the formation of jointed vertebrae limbs which allowed the first chordate to make their way to the land environment. The third trend involved the transitioning to a more suitable reproductive method such as the laying of amniotic eggs‚ which contains amniotic fluids that mimic an aquatic environment necessary for development. In mammals‚ the formation of the uterus allows the young to develop and mature inside the female and allows her to move actively around. The last trend is the development
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Renee Harris Period of the Zygote January 30‚ 2013 Child Development 101 Section KM Professor Brown The period of the zygote begins at fertilization. After a female egg is fertilized‚ the resulting one celled organism becomes known as a zygote. Once the egg is fertilized‚ the zygote begins a two-week period of rapid cell division and will eventually become an embryo. The zygote divides through a process known as mitosis‚ in which each cell doubles by dividing into two cells
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Question 1 | 1 points | Save | | Examination of the vaginal and cervical surfaces with a special magnifying instrument is called a ________scopy. | | | | | | | | colpo | | | vagino | | | cervico | | | culdo | | | | | | Question 2 | 1 points | Save | | ________itis is the inflammation of the inner lining of the cervix. | | | | | | | | Intercervic | | | Endometr | | | Endocervic | | | Perimetr | | | | | |
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Re 7B Reproduction About the Unit This Unit covers human reproduction and development. The Unit starts with an overview of what reproduction is and considers different modes of reproduction in animals. Human reproductive organs are then covered‚ along with adaptations of sex cells. This is followed by a look at sexual intercourse‚ the menstrual cycle‚ pregnancy and birth. The Unit ends with puberty and adolescence‚ a stage which many pupils will be going through or just about to
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Chromosomes Mutations With the exception of the mother’s egg cells or the father’s sperm cells‚ every cell in the normal human body contains 23 pairs of chromosomes‚ totaling 46 in each cell called the diploid number. According to The Human Genome project there are over 30‚000 genes in every cell‚ spread unevenly across the chromosomes. Of the 23 pairs of chromosomes‚ one member is inherited from the mother‚ and one from the father. Members of each pair are called homologous. The first 22 pairs
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surprised to learn that sperm only travel one tenth of a inch per minute. Even more interesting was how it is now believed that sperm locate the egg by smell. Its actually kinda funny to think of a sperm cell with a nose. The anatomy of the female reproductive system is complex‚ so they need all the help they can get. I was very shocked at the survival rate of the egg to full term infant. 50% seems like a very low number when compared to the amount of live births. The documentary became interesting for
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protective‚ overlapping scales‚ lateral line various modes; typical GI tract + glands: liver‚ gall bladder‚ pancreas 2 chambered heart gills covered by operculum paired fins‚ side 2 side mvmt of tail + body; swim bladder (depth) external fertilization eggs + milt Amphibia Amphibians (2 lives) frogs & toads (tailless) salamanders & newts born in water‚ adult lives on land (~ water); feet often webbed larva herbivorous+gills adult carnivorous+lungs thin‚ secretes mucus many breathe through it sensitive
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Stem cells -are biological cells found in all multi cellularorganisms‚ that can divide (throughmitosis) and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. In mammals‚ there are two broad types of stem cells: embryonic stem cells‚ which are isolated from the inner cell mass of blastocysts‚ and adult stem cells‚ which are found in various tissues. In adult organisms‚ stem cells and progenitor cells act as a repair system for the body‚ replenishing
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present. An amniocentesis is usually performed at 15-18 weeks of pregnancy and is the most commonly used test for the prenatal diagnosis of trisomy 18. During this procedure‚ a thin needle is inserted through the abdominal wall and a small sample of amniotic fluid is taken. Moreover‚ Chorionic villus sampling is performed earlier in pregnancy at 10-12 weeks after the last menstrual period. This procedure involves the collection a chorionic villus cell sample from the placenta either through the insertion
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