They have different genes.
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The right answer is kidney, bladder, ureter, urethra.
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The small intestine is important in our digestive system because it helps carry out most of the digestive process. It absorbs almost all of the nutrients you get from your food, and enter it into the bloodstream.
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A geneticist describes the phenotype of an individual with the alleles dd as homo-zygous recessive. In heterozygous individuals, it is masked by the dominant allele.
<h3>Dominant and recessive alleles</h3>
In diploid organisms, an individual receives two gene forms or 'alleles' for the same gene locus.
An individual is heterozygous when receives two different alleles for the same gene locus, whereas an individual is homo-zygous when receives the same alleles for a gene locus.
In cases of complete dominance, the dominant allele completely masks the recessive allele in heterozygous individuals.
Learn more about recessive alleles here:
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