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Suppose you are heterozygous for a mutant beta-thalassemia
allele. If the frequency of beta-thalassemia is 1/1600
persons, what is the probabilty that your prospective
spouse is heterozygous for a mutant beta-thalassemia allele?
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In cats yellow is due to gene B and black to its allele b. These genes are located on the X chromosome (sex-linked). The heterozygous results in calico (tortoise shell). What kinds of offspring (sex & color) are expected from the cross: black male & calico female? Most calico males are sterile, why?
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Micro Biology 
