Certain dominant genes are so important for normal development that mutant

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Kelly

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recessive alleles, called lethal? alleles, lead to the death of the organism when homozygous. In many cases, the heterozygote is normal. Consider the mating of two such heterozygotes. Among their surviving progeny, what fraction will be heterzygous? (a.) none (b.) one quarter (c.) one third (d.) one half (e.) two thirds
 
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