HW #15 - AP Biology Period 4 #22 Liem Nguyen 11/7/09...

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AP Biology Period – 4 #22 Liem Nguyen 11/7/09 Homework #15 (091113): Chapter 15 (due Friday 091113) Total points: 20 for Attempt on all questions ONE Concept Map: 10 points Objectives Relating Mendelian Inheritance to the Behavior of Chromosomes 1. Explain how the observations of cytologists and geneticists provided the basis for the chromosome theory of inheritance. -parallels between chromosomes and factors -chromosomes and genes (pairs) -Walter S. Sutton and Theodor Boveri: chromosome theory of inheritance -allele segregation (meiosis and fertilization) There are parallels between chromosomes and factors noted in the early 1900s. Scientists realized that chromosomes and genes are in pairs, and recognized allele segregation and fertilization procedures. After noting these observations, scientists found the chromosome theory of inheritance. 2. Explain why Drosophila melanogaster is a good experimental organism for genetic studies. -helpful for genetic studies -enormous # of offspring -4 pairs of chromosomes -easy, identifiable traits Morgan used Drosophila meanogaster for his genetic studies because it produced a large number of offspring, so he had the ease to find ratios. Since it had four pairs of chromosomes, the phenotypes were easily to be observed and identified. 3. Explain why linked genes do not assort independently. -deviated from Mendel’s law -law of independent assortment -genetically, only partially linked Linked genes cross on the same chromosome, which deviated from Mendel’s Law of Independent Assortment of the Chromosome. After, the genes are genetically, only partially linked, which also shows deviation. 4. Distinguish between parental and recombinant phenotypes. -parental: offspring with a phenotype that matches one of the parental phenotypes -recombinant types (recombinants): offspring whose phenotype differs from that of the parents Parental type is an offspring with a phenotype matching one of the parental
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phenotypes. Recombinant types, or recombinants, is an offspring whose phenotype differs from parents. 5. Explain how crossing over can unlink genes. - maternal/paternal chromatid break and rejoin -breaking of physical connection between genes on chromosome Crossing over occurs when the maternal and paternal gene have a break in their physical connections and then rejoin. Afterwards, this results in two nonsister chromatids changing places when crossing over occurs.
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HW #15 - AP Biology Period 4 #22 Liem Nguyen 11/7/09...

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