<span>There are other avenues to find the cure to diseases that do not involve exploiting fetuses.
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Answer:
A person can have normal chromosomes in number and structure, but still have a disease or condition caused by a mutation in one or more of the genes on the chromosomes. A single gene defect usually does not cause the chromosome structure or number to be abnormal.
Explanation:
I'm not sure if this is correct but hope it helps.
The first statement above is an example of incomplete dominance. If
the calf has black and white spots then that’s an example of codominance.
Incomplete dominance is a form of transitional
inheritance in which one allele for an explicit trait is not entirely expressed
over its paired allele. This effects in a third phenotype in which the
expressed physical trait is a mixture of the phenotypes of both alleles.
Codominance<span> is a form of dominance by which the alleles of a gene
pair in a heterozygote are wholly expressed. This effects in offspring with a
phenotype that is neither dominant or recessive. A usual example showing this type of dominance is
the ABO blood group system.</span>
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