Assignments 3 and 4 key - Assignment#3 and 4 Key Use the...

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Assignment #3 and 4 Key Use the assigned readings in your text and your lecture notes to address the following topics: Define the following terms: Blending inheritance: Now discredited idea that offspring were a 50/50 combination mix of maternal and paternal traits which fails to account for how variation is maintained Allele: one or more forms of a gene (ex. Green or yellow in reference to pea plants) Genotype: indicates the genes carried by an individual (ex. AA homozygote is the genotype of yellow peas). Represents the combination of alleles for a given gene. Phenotype: observable characteristics of an organism (ex. Yellow color is a phenotypic trait of pea plants with genotype AA or Aa). The physical expression of the genotype, and it can be influenced by the environment. Heterozygous: refers to the condition in which a pair of alleles at a single locus on homologous chromosomes are different. Linkage: refers to the inheritance, as a unit, of individual genes closely located on a chromosome, and represents an exception to the Law of Independent assortment (Mendel). Polymorphism: refers to the presence of two or more separate phenotypes for a certain gene in the population. Pleiotropy: refers to one gene that affects more than one phenotypic trait. Modern Synthesis: combination of natural selection and studies of variation at the phenotypic organismal level (paleontology, Darwin, etc) with an understanding of mechanisms of how inheritance worked from cellular biology ( Mendel etc.) to form the modern (mid 20 th century)
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