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All Quiz 1 Questions 092309

All Quiz 1 Questions 092309 - MATCHING For each of the...

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MATCHING: For each of the statements below, choose the letter corresponding to the term that is the best match. A. Epsitasis D. Incomplete dominance B. Law of Independent Assortment E. Variable expressivity C. Law of Segregation F. Variable penetrance ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ 1. Segregation of homologous chromosomes during the first meiotic division ensures that this is true. 2. In diploid organisms, gametes inherit only one allele from each gene. 3. Describes inheritance pattern of alleles for 2 or more unlinked genes. 4. Alleles of a gene located on chromosome I are inherited independently of alleles for a gene located on chromosome II. 5. A situation in which the phenotypic expression of a genotype at one locus depends on the genotype at another locus. 6. This phenomenon results from multiple genes being in the same biological pathway. 7. In a family, both parents are homozygous for the allele that causes green toenails, but only 6 out of 8 children have the green toenail phenotype. 8. Two female identical twins have the allele of BRCA1 that causes breast cancer, but only one of the twins develops breast cancer. 9. In a family of dragons, all of the siblings are homozygous for the recessive allele that causes shiny scales. All of the siblings are shiny, but some are shinier than others. 10. All cats of the curly breed are homozygous recessive for the rare allele that causes curly fur, but each curly cat’s fur varies somewhat in the degree of curliness. 11. Two genetically identical butterflies are light blue in color. When the two butterflies were mated together, they had progeny that there light blue, dark blue, and white in a 2:1:1 ratio. 12. In a particular species of plant there are three types of leaves: smooth edge, rough edge, and very rough edge. When a plant with rough edged leaves is ‘selfed’, about half of its progeny also have leaves with rough edges, about a quarter have leaves with smooth edges, and about a quarter leaves with very rough edges.
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FILL-IN-THE-BLANK: For each of the sentences below, fill in the blank with the best word(s) or number from the choices below. 0 25 50 75 100 alleles genes recombinants sister chromatids homologous chromosomes parental types 1. Members of the same species have the same _______ but often differ in their _______. 2. Homologous chromosomes have the same _______but can have different ________. 3. If two genes are linked, then the number of ________ will be less than the number of _________. 4. If two genes were located so close together on a chromosome that crossovers almost never occurred between them, the percentage of recombinant chromosomes after meiosis would be nearly ______ percent, and the genetic distance would be close to ______ cM or m.u.
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