Recessive traits are the alleles that are expressed when in the purebred condition. There is a 50% probability that one of the alleles was inherited from the mother.
Alleles are the gene variant that codes for the two forms of the same character. They can be dominant or recessive. The dominant alleles get expressed in heterozygous and purebred conditions while the recessive gets masked in the presence of the dominant.
There is a 50% probability that the alleles passes from the father and another 50% from the mother as half the alleles get inherited from each parent.
Therefore, option C. 50% is the probability of the inheritance.
Learn more about recessive allele and inheritance here:
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