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Lecture 9 - Pedigrees...

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3/6/10 1 Pedigrees Traits Many traits (hair color, eye color, and facial structure) exhibit incomplete dominance or codominance traits result from several genes interac:ng with each other and ac:ng simultaneously Polygenic traits ± phenotype results from interac:on of many genes, not the expression of just one mul$factorial traits± meaning polygenic traits that are also influenced by environment body type, muscular development, fat deposi:on, and height are all mul:factorial traits Codominance Sex Chromosomes Humans have one pair of chromosomes, called the sex chromosomes do not match in terms of size or content the sex chromosomes include the large X chromosome and the smaller Y These two determine gender if a Y chromosome is present during development (XY), the fetus will become a male if there is no Y present (XX), the fetus becomes female Any chromosome other than the sex chromosomes, (X and Y) are termed autosomal Sex‐linked Traits Sex chromosomes (X and Y) carry diFerent traits
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Lecture 9 - Pedigrees...

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