Parasitic Nutrition 21 May 2011 10:43 = organisms that live on or in another organism obtaining nourishment at the expense of the host and causing harm. Gut parasite (Taenia solium) = tapeworm Primary host = human (eat uncooked infected pork) Secondary host = pig (drainage channels contaminated by human faeces) Adaptations… - Suckers & hookers (attachment) - Body covering (immune responses) - Thick cuticle (inhibitory substances = enzymes) - Simple body systems (reproduction) - Very thin & large
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germ cells‚ with each possessing half the number of & Dickey‚ 2010). Meiosis is sexual and has 2 nuclear and cytoplasmic divisions. However‚ one must remember they both are preceded by Interphase. Meiosis produces haploid‚ diploid‚ and gametes cells. The gamete cells are known as sex cells that occur in the reproductive organs‚ and meiosis has sex cells whereas mitosis does not (Simon‚ Reece‚ & Dickey‚ 2010). The diploid cells split up to form four haploids (form of cell division that most eukaryotic
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Mechanisms of 2n gamete formation in plant ● ● ● ● ● Premeiotic doubling Omission of the first or second meiotic division Abnormal spindle Abnormal cytokinesis Nuclear fusion FDR ( first division restitution ) : Contains non-sister chromatids SDR ( second division restitution): Contains two sister chromatids 1 Introduction 1.3 The objective of this study ● Poplar can produce 2n gamete naturally or by artificial induction Elucidation of the cytological mechanisms of 2n gamete formation has
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Biology – Preliminary – Evolution of Australian Biota 1. Evidence for the rearrangement of crustal plates and continental drift indicates that Australia was once part of an ancient super continent identify and describe evidence that supports the assertion that Australia was once part of a landmass called Gondwana‚ including: ▪ − matching continental margins ▪ − position of mid-ocean ridges ▪ − spreading zones between continental plates ▪ − fossils in common on Gondwanan continents
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produced. There are two types of reproduction‚ which are; asexual and sexual reproduction. Asexual reproduction is creation of offspring whose genes all come from one parent. Sexual reproduction is creation of offspring by fusion of male gametes (sperm) and female gametes (eggs) to form zygotes. Asexual reproduction involves a type of cell division known as mitosis. Mitosis is the scientific term for nuclear cell division‚ where the nucleus of the cell divides‚ resulting in two sets of identical chromosomes
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Non-Disjunction Causes and Effects Overview This paper shows the basis of non-disjunction of chromosome‚ a failure of chromosomes to separate properly during cell division. It emphasizes particularly on how the reproductive cells or gametes is created during reproduction. The gametes of women are eggs and of men are sperms. When the egg and the sperm combine during fertilization at conception‚ they create a normal offspring with the proper number of chromosomes of 46. Nondisjunction occurs when these chromosome
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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 material for the offspring. Each gamete is haploid. Gametes fertilize to make a diploid offspring. | Both are methods of reproduction‚ in asexual one parent is needed and offspring are identical
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|Compare and contrast the processes of mitosis and meiosis. Discuss the roles and significance of mitosis and meiosis in the | |life of flowering plants and mammals‚ illustrating your answer with examples where appropriate. | Many living organisms in the Earth can continue because of the process of producing individuals called reproduction. Both mitosis and meiosis which are nuclear division in mitotic and meiotic cell division respectively play important roles
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between the two. Mitosis takes place within somatic cells (cells that make up the body)‚ while meiosis takes place within gamete cells (sex cells). As such‚ meiosis produces more gamete cells‚ and mitosis produces somatic cells. Mitosis is the process which is responsible for replacing dead or wounded skin cells. Mitosis divides a single somatic cell into two daughter cells‚ while gametes are produced in fours; more specifically‚ one single cell produces four daughter cells. The type of cell that each
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process of mitosis? Meiosis? An organism needs to undergo mitosis when it needs to grow or repair damaged cells. Mitosis is an asexual form of reproduction that does not require genetic information from two parents. Meiosis is needed to produce gametes in the reproductive organs. Meiosis occurs when an organism needs to reproduce and requires genetic information from two different parents. It is required for sexual reproduction. Meiosis increases the number of cells by division‚ and also reduces
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