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Unformatted text preview: R and X r . If youre keeping track of more than one X-linked allele at a time, youd write the chromosomes as X RB and X rb (or whatever the genotype actually is for the R and B genes). Suppose a male carries an X chromosome with the R allele and the b allele. How would you write his genotype? (Note: In the answer options, ^ means superscript) * X^Rb Y Why don't alleles from linked genes assort independently, if no crossing over occurs? *They are transmitted together (on the same chromosome), instead of being transmitted independently of each other. Why do alleles from linked genes assort independently, if crossing over DOES occur? * They end up on different chromosomes, so are then transmitted independently of each other....
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- Fall '07