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Unformatted text preview: 1 LAB 2 WORKSHEET NAME______________________ STUDENT #_______________ Group Members ______________________, ______________________, _________________________ 1. (2 marks) Proteins are responsible for the diversity of function within an individual, within a population and within the biosphere. This is because proteins can be made from 20 different amino acids. Using what you know about probability, calculate how many unique proteins could there be that are 100 amino acids in length? 2. (2.5 marks) Draw an acrocentric chromosome, labelling the centromere, the p arm, and the q arm. 3. (4 marks) In a particular species, the amount of DNA is measured in cells found at the various stages of meiosis. If there is 7.4 picograms (pg) in a cell at metaphase II, indicate how much DNA is present at the following stages. G 1 ______________ Prophase I ______________ G 2 ______________ Following telophase II and cytokinesis ______________ 4. (5 marks total) A cell has two pairs of acrocentric chromsosomes, 1a, 1b, 2a, 2b. (The a & b of each chromosome are the homologues.) Allele M is located on the long arm of chromosome 1a, and allele m is located at the same position on chromosome 1b. Allele P is located on the short arm of chromosome 1a, and allele p is located at the same position on chromosome 1b. Allele R is located on the long arm of chromosome 2a, and allele r is located at the same position on chromosome 2b. a. (3 marks) Draw these chromosomes, labelling genes M, m, P, p, R and r , as they might appear in metaphase I of meiosis. b. (2 marks) What process(es) generates different combinations of the alleles of genes M and P ? What processes generate variation among the alleles of genes M and R ? 5. (2 marks) For many pedigree questions you are often told an allele is rare in the population. When analyzing pedigrees what implications does this have for a dominant trait? What implications does it have for a recessive trait? 2 6. (3 marks total) A horse has 64 chromosomes and a donkey has 62 chromosomes. A cross between a female horse and a male donkey produces a mule, which is usually sterile. A) (1 mark) How many chromosomes would a horse and a male donkey produces a mule, which is usually sterile....
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