EXAM1 Q1. How many chromosomes are in a typical red blood cell taken from a normal person? Zero Q2. The degree to which a trait is expressed in individuals is the expressivity of the trait. Q3. In pedigrees‚ a male individual is symbolized as a square. Q4. The chromosomal structure that anchors the spindle fiber to the chromosome is centromere. Q5. The short arm of a submetacentric chromosome is symbolized as the p arm. Q6. Genetic diseases transmitted only by a mother to both sons and daughters
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This article is about evolution in biology. For other uses‚ see Evolution (disambiguation). Page semi-protected For a generally accessible and less technical introduction to the topic‚ see Introduction to evolution. Part of a series on Evolutionary biology Diagrammatic representation of the divergence of modern taxonomic groups from their common ancestor. Key topics[show] Processes and outcomes[show] Natural history[show] History of evolutionary theory[show] Fields and applications[show]
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Tree Plantations Introduction For over 10‚000 years‚ man has been the greatest factor affecting biodiversity through habitat destruction and fragmentation‚ overexploitation and pollution. With an ever increasing population and human activities‚ man is consuming more and more natural resources by increasing the use of energy‚ fuel‚ and production of consumer products that are not necessarily needed. Man is very egotistic and believes that he owns everything that he has discovered; using most
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the fungus receives photosynthate in return (Ceballos et al. 2013‚ Collins and Foster 2009‚ Welsh et al. 2010‚ Wilson et al. 2001). The response of plants to mycorrhizae varies greatly on the combination of plant and fungus genotypes (Bray et al. 2003). Different fungal genotypes can have positive‚ negative‚ or little effect on the growth of the same host species (Reinhart et al. 2012‚ Zhang et al. 2010). Certain mycorrhizae are more beneficial to different plant hosts due preferential allocation of
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Introduction The major topic of this experiment was to examine two different crosses between Drosophila fruit flies and to determine how many flies of each phenotype were produced. Phenotype refers to an individual’s appearance‚ where as genotype refers to an individual’s genes. The basic law of genetics that was examined in this lab was formulated by a man often times called the "father of genetics‚" Gregor Mendel. He determined that individuals have two alternate forms of a gene‚ referred
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Human Evolution During the evolution process from ape to man‚ it could be concluded that the biped and upright walking posture was a requirement for the emergence of human beings while the true difference between human and ape was the ability to make and use tools. Besides‚ the perfection of upright walking was the result of adapting the natural environment and the motivation for physical evolution of human. This posture positioned the head from the front to the top of body‚
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Meiosis results in four daughter cells‚ each having one-half the normal number of chromosomes (23). Genes that code for a particular trait come in several forms or alleles. Genotype refers to the particular set of alleles an individual receives. Phenotype refers to an individual’s observable attributes. People with different genotypes may have similar phenotypes. Some traits involve only one gene locus and are called single-gene traits. The transmission of these traits from parent to offspring follows
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IB204 Mock exam 1 1) Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair‚ what fraction of their offspring would be expected to have straight hair? A) 1/2 straight B) 1/4 curly C) 100% straight D) 3/4 curly E) It is impossible to predict the outcome. 2) Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino was crossed with a second black one‚ 4
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ABSTRACT Insect repellants are important tools for prevention of insect-borne disease as well as painful or uncomforatable insect bites.And on of natural insect repellant is the lemon grass(Cymbopogon Citratus).Determing the effectiveness of lemon grass as insect repellent is the main goal of the study.Specially‚it intends to apply the Steam Distillation Technique in obtainingthe natural elements and essential oil of lemon grass such as citraland citronella.Using
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genetically "invalid" children. Everything‚ from the gender of the child‚ to the colour of their hair‚ can be manipulated‚ and is rationalized by stating that the child is "Still you‚ just the very best of you". In this type of society‚ only the genotype is important‚ and all else is regarded. Morally and ethically‚ society knows realistically that perfection does not exist‚ and it is the flaws within humans that set us apart from other species. The Human Genome project‚ a revolutionary study
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