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Unformatted text preview: 1001, Spring 2012--Genes and Gene Expression, R.L. Rodriguez 2012 4 Human X Chromosome Illustrates Gene Linkage Some of the X-linked gene discussed previously have been mapped to on the human X chromosome. Note that the Hemophilia A gene is linked to the Colorblindness on the long (q) of the X.
March 19, 2012 p Ocular albinism BIS101001, Spring 2012--Genes and Gene Expression, R.L. Rodriguez 2012 5 Morgan's analysis eye color and wing shape Two genes close together on the same chromosome behave as one gene (i.e., they do not assort independently). March 19, 2012 BIS101001, Spring 2012--Genes and Gene Expression, R.L. Rodriguez 2012 6 Gene/Mutant Nomenclature To simplify the description of genetic crosses involving multiple loci, geneticists have developed the shorthand nomenclature shown below. With this nomenclature, the locus is given a one- or two-letter italic designation based on the mutant or alternate allele. The recessive mutant allele is indicated with lower case letters while the normal (wild type) allele is indicated with capital letters or simply with a "+" sign. For example, the fruit fly ty...
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