Introduction to sexual reproduction in humans Reproduction is the process by which humans gives rise to new individuals. Sexual reproduction is the process that involves the fusion of two gametes‚ sperm (male gamete) and egg (female gamete). In human these gametes are produced in different sexes‚ the male and female. Reproduction in humans is performed by reproductive systems‚ the male and female reproductive systems. The main organs of male reproductive system are testis and gonads and of female
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Female reproduction Functions Transport eggs Transport sperm from uterus Fertilization Regions of Oviduct Infundibulum Funnel shaped Fimbriae Ostium opens into peritoneal cavity Ampulla Thin walls Region of fertilization Isthmus Narrower Uterotubual junction Inner diameter 1mm Histology of tube wall Outer serosa continuous with uterine surface Middle muscular layer Inner mucosa Lumen (hollow area) Interior surface of oviduct Mucosal surface highly folded Cilia move
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Introduction Man has propagated plant material almost as long as he has cultivated the land to produce food. For a long time‚ plant material was propagated mainly by using the seeds of existing plants. Better methods were discovered over time‚ methods that allowed the farmer to retain the desirable qualities of the plant material‚ while eliminating some of the less desirable qualities. Through these methods‚ the farmer was also able to eliminate the variations between plants of the same cultivar and produce
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acid rain Acid rain is rain or any other form of precipitation that is unusually acidic. It has harmful effects on plants‚ aquatic animals‚ and infrastructure. Acid rain is mostly caused by human emissions of sulfur and nitrogen compounds which react in the atmosphere to produce acids. In recent years‚ many governments have introduced laws to reduce these emissions. Emissions from volcanoes and those from biological processes that occur on the land‚ in wetlands‚ and in the oceans account for the
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Chapter 6: Children’s Peer Cultures and Interpretive Reproduction I. Examining Peer Culture From Children’s Perspective A. Children and their peer cultures are worthy of documentation and study in their own right. B. Children’s culture is not something kids carry around in their heads to guide their Goffman‚ 1974). C. Childrens peer culture as a stable set of activists or routines‚ artifacts‚ values‚ and concerns that children produce and share in interaction with peers (Corsaro‚
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Mechanical Reproduction in the Age of Art Paul Mattick Jr Theory‚ Culture & Society (SAGE‚ London‚ Newbury Park and New Delhi)‚ Vol.10 (1993)‚ 127-147 The enormous impact of Waller Benjamin ’s famous essay on ’The Work of Art in the Age of its Mechanical Reproduction ’ is largely due to his claim that photography has ’transformed the entire nature of art‚ destroying its semblance of autonomy in relation to social and political processes‚ and liquidating ’the traditional value of thc cultural
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Asexual Reproduction Worksheet This worksheet accompanies Asexual Reproduction.ppt and Cloning.ppt 1. Explain what asexual reproduction is‚ using a spider plant as an example. ……………………………………………………………………………………………………………………….………………………………………………………………………………………………..……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… 2. Name two other organisms that reproduce asexually. …………………………………………………………………………………………… ……………..............
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Characteristics to Compare | Items to be Compared (# 3 Description) | Similarities and/or Differences | | Asexual Reproduction | Sexual Reproduction | | Process Description | Mitotic division‚ requiring only one parent. Offspring are identical replicas of parent. Cell divides after DNA is replicated. No gametes are formed‚ can also occur by fragmentation (a piece of the organism breaking off) | Meiotic division. 2 parents are required. Each parent contributes ½ of the genetic
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o Asexual reproduction Asexual reproduction involves only one parent individual‚ be in plant or animal. Asexual reproduction has many advantages. It is safe‚ certain (there are no problems of finding a receptive mate) and can give rise to large numbers of offspring very rapidly. The offspring produces are almost all genetically identical to the parent organism‚ and so a successful genetic combination can be passed on without change. This is an important advantage of asexual reproduction until living
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Plant Adaptation Investigation Observations Samples of plants were obtained during the campus tour. In order survive in the harsh climate of deserts‚ plants must adapt in function‚ reproduction‚ support‚ and defense. Although plants on campus are watered frequently‚ they live in a mostly xeric environment. Three types of cacti were observed: organ pipe‚ prickly pear‚ and saguaro. The organ pipe contains no leaves and has narrow stems that carry out photosynthesis and store water. Neither the
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