Introduction: The process of Meiosis involves 2 nuclear divisions that result in the formation of four haploid cells (2). Meiosis I is preceded by interphase‚ during which DNA synthesis occurs and each chromosome is made of two chromatids joined at the centromeres. In meiosis I‚ chromatids of homologous chromosomes may exchange parts by crossing over. During Prophase I homologous chromosomes come together and synapse. A tetrad consisting of four chromatids is also formed (2). In Metaphase I‚ the
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Gene therapy is being currently developed in labs across the world‚ with the goal of eventually being able to alter a person’s genetic make up effectively and consistently. If the subject has a missing or defective gene‚ scientists are able to inactivate the mutated gene and transplant a normal healthy one. Should the mutated gene be responsible for the lack of production to a particular protein‚ gene therapy may be able to restore normal function of the polypeptide and essential save the cell and
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(method of reproduction found in many invertebrate organisms). o Sexual reproduction Sexual reproduction carries considerably more risk. It involves the combining of genetic information from to individuals. The meeting of the special sex cells (gametes)‚ which carry this information is by no means certain and arranging for them to meet often carries an element of risk‚ for animals at least. But the great advantage of sexual reproduction is that it introduces variety‚ which is of great value when
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Ch. 51- FAP: sequence of behaviors that are usually carried through to completion. Habituation:loss of sensitivity to unimportant stimuli. Associative learning: associating one stimulus with another. Class. Conditioning: association of an irrelevant stimulus with a fixed physiological response. Cognition: animal’s ability to perceive‚ store‚ process‚ and use info. from its sensory receptors. Agonistic behavior: contest to determine which competitor gains access to a resource. Ch. 54- Nitrogen fixation:
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Name: ______________________________________ Date: ________________________ Student Exploration: Pollination: Flower to Fruit Vocabulary: anther‚ cross pollination‚ filament‚ fruit‚ nectar‚ ovary‚ ovule‚ pedicel‚ petal‚ pistil‚ pollen‚ pollen tube‚ pollination‚ receptacle‚ self pollination‚ sepal‚ stamen‚ stigma‚ style Prior Knowledge Question (Do this BEFORE using the Gizmo.) Plants use sunlight to produce sugar. Flowering plants make some of this sugar available to animals in the
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Cyclospora cayetanensis Synonym: Cryptosporidium cayetanensis Tauxe‚ 1997 lapsus Synonym: Cyclospora cayetenensis Duluol‚ Teilhac‚ Poirot‚ Heyer‚ Beaugerie‚ & Chatelet‚ 1996 lapsus Updated: 31 October 2001 E-mail: Steve J. Upton Division of Biology‚ Kansas State University‚ Manhattan‚ KS 66506 Main menu: Cryptosporidium homepage History: The first published report of Cyclospora cayetanensis in humans appears to be by Ashford (1979)‚ who found unidentified Isospora-like coccidia in the feces
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out some part of their arms to gather food. The mucus covered arms have tiny tube that flick edible bits into the pinnacle and arm. Reproduction Crinoids are dioecious‚ with separate male and female. They are producing their gametes from genital canals found inside some of the pinnules. The pinnules eventually rupture to release sperm and eggs into sea water. The fertilized eggs hatch to release a free swimming vitellaria larva. While both feeding and non-feeding larvae exist
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Gregor Mendel 1. Who was Gregor Mendel? Mendel was a scientist who gained a substantial amount of fame from his study of genetics. He studied the pea plant and its inheritance of certain traits. 2. What contributions did he make to science? His study of genetics led to an increase interest in the study of genetics. His biggest contribution to the study of science was his discovery of particulate inheritance‚ dominant and recessive traits‚ genotype and phenotype‚ and the concept of
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said Ovenden. Hybridization is common among many animal species‚ including some fish‚ but until now it has been unknown among sharks. In most fish species‚ fertilization takes place outside the body‚ with the males and females each releasing their gametes into the water where they mix. Blacktip sharks‚ by contrast‚ give birth to live young and actively choose their mates‚ which‚ as the scientists discovered‚ can sometimes be of a different species. Ovenden speculated that the two species began mating
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9.1.2 3 difference between monocots and dicots 3 differences between monocots and dicots 1. Monocots have parallel venations along their leaf 2. Dicot roots have X-shaped xylem whereas monocots are organized into a ring 3. Dicot stem xylem form a ring around the outside whereas monocot xylems are scattered 9.1.3 Distribution of tissues in leaves and functions In the leaf you have xylem and phloem tissues. Xylem tissues act like transport tubes‚ transporting water and minerals. Phloem tissues
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