Write your name here Surname Other names Edexcel Certificate Edexcel International GCSE Centre Number Candidate Number Biology Unit: KBI0/4BI0 Science (Double Award) KSC0/4SC0 Paper: 1B Tuesday 15 May 2012 – Morning Time: 2 hours You must have: Ruler Calculator Paper Reference KBI0/1B 4BI0/1B KSC0/1B 4SC0/1B Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name‚ centre number and candidate number. Answer all questions
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Name __________________________________ AP Biology Period _________ Date ______________________ AP: LAB-RELATED AP EXAM ESSAYS LAB 1. OSMOSIS AND DIFFUSION ESSAY 1992 A laboratory assistant prepared solutions of 0.8 M‚ 0.6 M‚ 0.4 M‚ and 0.2 M sucrose‚ but forgot to label them. After realizing the error‚ the assistant randomly labeled the flasks containing these four unknown solutions as flask A‚ flask B‚ flask C‚ and flask D. Design an experiment‚ based on the principles of diffusion
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much faster than natural selection. The breeder will attempt to isolate and propagate the genotype of the desired trait. [1] Selective breeding can be seen as a way of breeding out unwanted alleles from a population‚ restricting genetic variation. Some people see this as an advantage as the unwanted allele is no longer present; however the disadvantage of this is the reduction of genetic diversity. Breeding animals and plants to have desired traits will benefit the plant/animal in their current
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Huntington’s Disease Huntington’s disease‚ or also known as Huntington’s Chorea‚ is an incurable hereditary brain disorder‚ which causes nerve cells to become damaged‚ resulting in various parts of the brain deteriorating. Huntington’s disease was recognized by George Huntington in 1872. Huntington’s disease had been acknowledged as a disease entity previously‚ several people before 1872 reported having and describing movement disorders that later would be connected to Huntington’s disease. The
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Virtual Lab: Punnett Squares Worksheet Part I: Answer the following questions: 1. Which of the following is most inclusive? a. allele b. genotype 2. Dominant alleles are represented by: a. an upper case letter b. a lower case letter c. it does not matter what type of letter is used 3. In fruit flies‚ gray body color is dominant over black body color. Using the letter G to represent body color‚ what is the genotype of a heterozygous gray bodied fly? a.
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News” 1. Nancy’s genetic make up with the information given that she is a carrier she would have (Ff) or in terns that she is a female it’d be XF‚ Xf. 2. The chance Nancy will pass on her recessive allele to her baby would be 50%. 3. The chance that Jake would pass on his recessive allele would again be 50% 4. The baby ahs a 75% chance now of getting CF since both the parents are carriers. If parents decided on having more babies they would still have a 75% chance of getting CF. But if
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Nikki Le Anthro 102 Alyson Rollins Assignment #1 #1 Jared Diamond presents many hypotheses in the article “Curse and Blessing of the Ghetto”. The four main points he brings up is that a new mutation could be arising as the old copies of Tay-Sachs disappear. Secondly‚ Diamond believes that this gene could help fight against tuberculosis. Third‚ people who already possessed this Tay Sachs gene at a high frequency could have easily acquired this gene. Lastly‚ Diamond believed that this gene originated
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population splitting and speciation” (Komya‚ Fujita‚ Watanabe‚ 2011‚ p. 1). 2. Discuss the types of mutations. Recessive mutation is when both alleles are mutant “in order for the mutant phenotype to be observed” (“Section 8.1 Mutations‚” 2000). Dominant mutations are seen “in a heterozygous individual carrying one mutant and one normal allele” (“Section 8.1 Mutations‚” 2000). Recessive and dominant mutations have different characteristics in terms of inheritance in relation to genes. Other
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heterozygous genotype is like this which can be called by the information given a dihybrid crossing which‚ “or example‚ a heterozygous parent (PpTt) can pass on the following combinations of alleles: (PT)‚ (Pt)‚ (pT)‚ (pt). Each box of the Punnett square is labeled with one of these possible combinations of alleles.” So when you look at it that way the offspring have both allies and that a homozygous and heterozygous cane have the same genotype 4. What genetic information can be obtained from a Punnett
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The law of dominance stated that in a heterozygous condition‚ the dominant allele will dominate over another allele. This means that the dominant trait or phenotype will be present. The law of segregation states that for any trait or phenotype‚ the parent alleles will separate and only one allele from each parent will pass to the offspring. (O’Neil‚ 2011) The law of independent assortment states that different pairs of alleles are passed to each other independently. (O’Neil‚ 2011) Because of Mendel’s
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