Reproduction in humans Reproduction Reproduction is a characteristic of all living organisms. It is the process that makes more of the same kind of organism. Reproduction is essential in all species to ensure that the species does not extinct. There are two types of reproduction‚ Asexual and sexual reproduction. Asexual Reproduction: Asexual means not sexual. This means that this kind of reproduction does not involve sex. Asexual reproduction is the production of genetically identical offspring from
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Smajdor‚ A. (2007). From IVF to Immortality: Controversy in the Era of Reproductive Technology. NY: Oxford University Press Inc.‚ New York. Dohle‚ G.R.‚ Ramos‚ L.‚ Pieters‚ M.H.E.C.‚ Braat‚ D.D.M.‚ Weber‚ R.F.A. (1998). Surgical sperm retrieval and intracytoplasmic sperm injection as treatment of obstructive azoospermia.Hum Reprod，1998，13（3）:620-623. Gorringe‚ R.‚ et al.(2009). Oxford Advanced Learner ’s Dictionary. England: Oxford University Press. Hvistendahl‚ M. (2011). Unnatural Selection. In
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would happen if meiosis did not occur? Mitosis is the cell process of growth and division whereas meiosis is the process of developing reproductive cells. The sperm and egg are critical components for almost all living organisms. Every living organism begins with one cell that came from our father’s sperm fertilizing our mother’s egg. This beginning cell then divided by mitosis into two cells (called daughter cells) which then grow and divided into four cells. Mitosis continues through when we
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in reproductive technology‚ there is hope for these couples who desperately wish to have children. One of these advances is In Vitro Fertilization‚ also known as IVF. IVF‚ or‚ in vitro meaning‚ “in glass” fertilization is the process by which eggs and sperm are combined outside the woman’s body in a glass petri dish and then later transferred back into the uterus in hope of achieving a pregnancy. This amazing technology has been around since the late 1970’s and the first child was born through IVF
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described the sperm and the journey that they have to go thru to even fertilize an egg is really amazing to me. I was a little grossed out by the sperm cemetery. It’s amazing how 99% of the sperm are killed instantly and only about 3000 of them make it thru just the vagina. Then only certain sperm with a chemical coating make it thru the fallopian tubes. Once they make it thru they can finally rest and wait. The releasing egg sends chemical signals luring the sperm towards it. Once the sperm enters the
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Describe the Treatments Available to Help Infertile Couples The definition of being infertile for a woman is to be unable to conceive a child by the usual natural process. For a man to be infertile‚ he is unable to produce sperm that have the capacity of fertilizing a woman’s egg. Up to 10% of couples in the UK who want children can be considered infertile. Due to this being such a large percentage there are now many ways to get round this through different treatments. Although some may pose potential
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(commonly called sperm cells) and gametes produced by females through Oogenesis process are called oocytes (commonly referred to as ova or eggs). As gametes are formed‚ the 46 chromosomes from each parent cell (23 pairs of chromosomes) are divided through meiosis so that each gamete is haploid‚ having only 23 unpaired chromosomes. Spermatozoa‚ produced by males‚ contain a 23rd chromosome that is either an X chromosome (female) or the analogous Y chromosome (male)‚ making each sperm cell either female
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long as it stretches and thickens in order to support the increasing weight of the pregnant reproductive tract. The Ovary Follicle Development The ovary of the pig is primarily important because it is the source for both reproductive hormones and eggs. The ovary is particularly responsive to important hormones that are released from other organs‚ especially those of the pituitary. The pituitary is located near the base of the brain and is the source
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becoming pregnant. Most women ovulate each month this is when an egg is released by the ovaries. For women with a 28-day menstrual cycle‚ ovulation typically occurs on day 14. During intercourse the man will ejaculate and sperm will be passed from the testicles via the penis into the woman’s vagina. If a sperm meets the egg‚ fertilisation may occur. During a male ejaculation‚ there are anywhere between 60 million and 500 million sperm that have a go at the ’big race’. They cross the collar of the
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failure to produce mature eggs‚ malfunction of the hypothalamus or the pituitary gland. Endometriotis is a condition that is characterized by excessive growth of the lining of the uterus‚ called the endometrium. Growth occurs not only in the uterus but also elsewhere in the abdomen‚ such as in the fallopian tubes‚ ovaries and the pelvic peritoneum. Female tube blockages Blocked or damaged fallopian tubes prevent eggs from getting to the uterus and sperm from getting to the egg. Causes include severe
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