Who is the most likely carrier of a genetic disorder?Group of answer choicesA male with one allele for Huntington's disease, an autosomal dominant genetic disorder.A male with two alleles for cystic fibrosis, an autosomal recessive disorder.A male with one allele for phenilketonuria (PKU), an autosomal recessive disorder.A male with one allele for hemophilia, an X-linked genetic disorder.A male with one allele for blood group A.
Question
Who is the most likely carrier of a genetic disorder?Group of answer choicesA male with one allele for Huntington's disease, an autosomal dominant genetic disorder.A male with two alleles for cystic fibrosis, an autosomal recessive disorder.A male with one allele for phenilketonuria (PKU), an autosomal recessive disorder.A male with one allele for hemophilia, an X-linked genetic disorder.A male with one allele for blood group A.
Solution
The most likely carrier of a genetic disorder would be "A male with two alleles for cystic fibrosis, an autosomal recessive disorder."
Here's why:
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A male with one allele for Huntington's disease, an autosomal dominant genetic disorder: This individual would not just be a carrier, but would actually have the disease because Huntington's is a dominant disorder, meaning only one copy of the disease-causing allele is needed to have the disorder.
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A male with two alleles for cystic fibrosis, an autosomal recessive disorder: This individual would have the disease, not just be a carrier, because he has two copies of the disease-causing allele. Cystic fibrosis is a recessive disorder, meaning two copies of the disease-causing allele are needed to have the disorder.
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A male with one allele for phenylketonuria (PKU), an autosomal recessive disorder: This individual would be a carrier, but not have the disease, because PKU is a recessive disorder, meaning two copies of the disease-causing allele are needed to have the disorder.
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A male with one allele for hemophilia, an X-linked genetic disorder: This individual would have the disease, not just be a carrier, because males only have one X chromosome. Therefore, if they inherit the disease-causing allele, they will have the disorder.
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A male with one allele for blood group A: This individual would not be a carrier of a genetic disorder, as blood type is not a genetic disorder.
So, the most likely carrier (meaning they have the disease-causing allele but do not have the disease) would be the male with one allele for PKU. However, the individual who is most likely to have a genetic disorder is the male with two alleles for cystic fibrosis.
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