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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mheducation.com/sites/9834092339/student_view0/chapter20/simulation_of_genetic_drift.html http://anthro.palomar.edu/synthetic/synth_5.htm Genetic drift has many factors that can be linked to the extinction of a species. Genetic drift is a change in allele frequency which can rise or fall over time. Genetic drift lowers genetic variation every generation. The strength genetic drift depends on the size of population. Therefore the lower the population size‚ the less genetic variation there will be compared
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of Independent Assortment: o “the behavior of each pair of differing traits in a hybrid association is independent of all other differences in the two parental strand” o During the course of segregation of alleles different genes assort/ combine indefinitely and independently with other alleles of other genes o Exception “Linked Genes” Reviews on Mendel’s Paper: Mendel is not a Mendelian About speciation and hybridization He tried to find a generally applicable law governing the formation and
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35 mu apart. If a plant of the genotype R S r s is selfed‚ what progeny phenotypes will be seen and in what proportions? 5. The allele b gives Drosophila flies a black body and b+ gives brown‚ the wild-type phenotype. The allele wx of a separate gene gives waxy wings and wx+ gives nonwaxy‚ the wild-type phenotype. The allele cn of a third gene gives cinnabar eyes and cn+ gives red‚ the wild-type phenotype. A female heterozygous for these three genes is testcrossed‚ and 1000
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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 from people with a more Jewish background and this gene was more dominant in their society. #2 One possible ethical issue involved with genetic testing would
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Vries all found that Mendel had explained the same result 35 years go. Resistance remained about Mendels laws until evidence had supported it. Chromosoems and genes are both present in pairs of diploid cells. Homologous chromosomes separate and alleles segregate during meiosis. Fertilization restores the paired condition for both chromosomes and genes. Around 1902‚ the chromosome theory of inheritance began to take form. Thomas Hunt Morgan was the first t associate a specific gene with a specific
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Revision Checklist for IGCSE Biology 0610 Guide for Students REVISION CHECKLIST for IGCSE Biology 0610 A guide for students How to use this guide The guide describes what you need to know about your IGSCE Biology examination. It can be used to help you to plan your revision programme for the theory examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you revise by using the tick boxes in Section 3‚ ‘What you need to know?’‚ to
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an 11 : 11 ratio‚ do you think it would be possible to find a pod with all yellow peas? All green? Explain. Answer: Yes‚ it is possible to find a pod with only yellow peas or heterozygous for the seed color gene‚ if all the flowers had dominant allele in a given fruit/pod. This could be also one example of rare changes at a physiological level. 3. In Table 2-1‚ state the recessive phenotype in each of the seven cases. Answer: wrinkled seeds; green seeds; white petals; pinched pods; yellow
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short-haired guinea pig and a homozygous white‚ long-haired guinea pig. Assume Black color (B) and short-hair (S) are dominant traits. 2. The ability to roll the tongue into almost a complete circle is conferred by a dominant trait‚ while its recessive allele fails to confer this ability. A man and his wife can both roll their tongues and are surprised to find that their son cannot! Explain this by showing the genotypes of all three persons. 3. In rabbits‚ spotted coat (S) is dominant to solid‚ and
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heterozygous‚ Cross F1 x F1 F2 generation shows individuals of both phenotypes‚ in a specific ratio 9:3:3:1 -this would only occur if independent assortment = 2 alleles separate & sort independently into gametes Mendel Rules of inheritance Different alleles for the same gene Principle of segregation-each gamete has 1 allele of each gene Principle of independent assortment Meisois Results in patterns of inheritance by Mendel Meisois 1 is during which segregation occur and principle
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