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Unformatted text preview: heritance for a particular trait See Figures 13.21; 13.22 Does this pedigree represent recessive or dominant inheritance? Chromosomal Theory of Inheritance
s Genes are located on chromosomes.
x 1902- Boveri & Sutton s Autosomes= Humans = 22 pair
x Same genes on both homologues. s Sex chromosomes in humans: Female = XX; Male = XY
x Males determine the gender! x X-linked- Genes carried on X chromosome
3 2000 genes s How it all began- 1900's Thomas Hunt Morgan (Nobel in 1933)
x Looked for a relationship between gender & traits working with fruit fly eye color.
s Morgan found- some traits are inherited as a group:
x Linkage = tendency of genes on the same chromosome to end up together in the same gamete. s Linked genes are inherited together and are close together on the chromosome. x So, Mendel's law of independent assortment applies to genes on different chromosomes. Chromosomal Inheritance
s Sex-linked inheritance
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- Spring '10