webnotes_lec9_genetics_bs110_092707

webnotes_lec9_genetics_bs110_092707 - Case 6: Linked Genes...

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BRCA2 Gene Locus: Long arm of Chromosome 13 base pair 31,787,616 - 31,871,804
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bp 31,787,615 bp 31,871,805 A T T G C A A C G T T A C C G T A A C G T T G C A A T G G C bp 1 bp 31,787,615 bp 31,871,805 A A A G C A A C G T T A C C G T T T C G T T G C A A T G G C bp 1
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Case 1: Co-dominance (Incomplete Dominance) alleles for a trait are equally dominant both alleles are expressed heterozygote phenotype is intermediate the 2 homozygous conditions “Non-Mendelian” Genetics Case 2: Epistasis “standing upon” one allele pair interferes with the expression of another allele pair
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2 Pink Snapdragons (incomplete/co-dominance):
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Case 3: Pleiotropy 1 gene many traits Case 4: Polygenic Inheritance many genes 1 trait Case 5: Environmental Interactions Phenotype = genes + environment
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Unformatted text preview: Case 6: Linked Genes Genes that occur on the same chromosome will not assort independently Independent assortment applies to whole chromosomes Case 7: Sex-Linked Genes Genes that occur on the sex chromosomes X-linked traits - more common in men In males, inheritance is from mother only Inheritance of Y: father to son only t f F T T t F f Q Q q q Metaphase of Meiosis 1 R R R R A A a a Case 7: Sex-Linked Genes Genes that occur on the sex chromosomes X-linked traits - more common in men In males, inheritance is from mother only Color-blindness is caused by a recessive gene (b) on the X chromosome. Predict phenotypes for children of a female carrier with a normal male....
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webnotes_lec9_genetics_bs110_092707 - Case 6: Linked Genes...

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