BIOL 222 assigned problems - Joshua Marceau Biology to 222,...

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Biology to 222, genetics CHAPTER 2 (SINGLE GENE INHERITANCE) ASSIGNED PROBLEMS 5) Named the key function of mitosis. Mitosis produces genetically identical daughter cells 6) Name to key functions of meiosis. Meiosis is produces genetically different daughter cells; it also produces for daughter cells each with only one chromosome 20) If you had a fruit fly that was a phenotype a, what test would you make to determine if the flies genotype was A/A or A/a? A good test would be to cross the fruit fly with another fruit fly that was of genotype a/a. If the first fruit fly’s genotype was A/A then all F1 progeny would be phenotype A, if the fruit fly’s genotype was A/a then you would get a ratio of ¾ A and ¼ a phenotype. 26) From a large-scale screening of many plants of Collinsia grandifloura, a plant with three cotyledons was discovered (normally there are two). This plan was crossed with a normal pure breeding wild type plants and 600 seeds from this cross were planted. There were 298 plans with two cotyledons, and 302 with three cotyledons. What can be deduced about the inheritance of three cotyledons? Invent gene symbols as part of your explanation. T = three cotyledons & t = two cotyledons. Wild type = (t, t) mutant = (T,?) Since the ratio of the two plants was 1:1, the mutant probably has a genotype of (T,t), where gene T is recessive. 30) The ability to taste the chemical phenylthiocarbamide is an autosomal dominant phenotype, and the inability to taste it is recessive. If a taster woman with a non-taster father marries a taster man who in a previous marriage had a non-taster daughter, what is the probability that their first child will be? 1) A non-taster girl 2) A taster girl 3) A taster boy 38 a(1 and 2 only)) four human pedigrees are shown in the accompanying illustration. The black symbols represented abnormal phenotype inherited in a simple and Mendelian manner. For each pedigree, state whether the abnormal condition is dominant or recessive. Try to state the logic behind your answer. For each pedigree, described the genotypes of as many persons as possible. 47) An X- linked dominant allele causes hypophosphatemia in humans. A man with hypophosphatemia marries a normal woman. What proportion of their sons will have hypophosphatemia? 52) A sex linked recessive allele see produces red-green color blindness in humans. A normal woman whose father was colorblind marries a colorblind man. C = colorblind and c = not colorblind a) What genotypes are possible for the mother of the colorblind man? Possibilities = (XC,Xc) (Xc,Xc), the combination (XC,XC) is not possible because the woman had a
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This note was uploaded on 09/28/2008 for the course BIOL 222 taught by Professor Babitzke,paullee during the Fall '07 term at Pennsylvania State University, University Park.

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BIOL 222 assigned problems - Joshua Marceau Biology to 222,...

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