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Unformatted text preview: pair with alleles for one trait: RrTt RT , Rt , rT , rt Autosomal, two linked traits One pair of homologs, each chromosome with alleles for both traits: Can be written any of four ways; all mean the same thing. The line(s) separate the homologs. Pq/pQ Pq Pq Pq//pQ pQ pQ Pq , pQ Note that the underline notation indicating linkage should be used for gametes, too. X-linked 2 , one trait ± ² ± : X B X b ² : X B Y ± : X B , X b ² : X B , Y X-linked 2 , two traits ± ² ± : X Bh X bH ² : X Bh Y ± : X Bh , X bH ² : X Bh , Y X-linked 2 and autosomal traits in the same cross ± ² ± : TtX B X b ² : TtX b Y ± : TX B , TX b , tX B , tX b ² : TX b , tX b TY, tY Notes: 1 The gametes shown assume no recombination between linked alleles. 2 In almost all cases, only the X chromosome has alleles for the gene(s) of interest. Recall that ± = female, ² = male. Now, what if there are three traits, or four, or five … ? R r t T X b X B X B Y X B h X b H X B h Y X b X B t T X b t T Y...
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This note was uploaded on 11/02/2011 for the course BIOL 11102 taught by Professor Parks,john during the Spring '11 term at University of Washington.
- Spring '11