If a child is born with a genetic disorder when neither of his biological parents have that disorder, the trait is likely to be caused by: a recessive allele on an autosome a gene on the X chromosome a dominant allele on the autosome a gene on the Y chromosome
Question
If a child is born with a genetic disorder when neither of his biological parents have that disorder, the trait is likely to be caused by: a recessive allele on an autosome a gene on the X chromosome a dominant allele on the autosome a gene on the Y chromosome
Solution
The trait is likely to be caused by a recessive allele on an autosome. Here's why:
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Genetic disorders can be caused by different types of mutations, including those on autosomes and sex chromosomes.
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If neither parent has the disorder, it's less likely that the disorder is caused by a dominant allele on an autosome. This is because dominant alleles would typically present the disorder in the parent if they had it.
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It's also less likely to be a gene on the X or Y chromosome. Disorders linked to these chromosomes often show different patterns of inheritance. For example, if a disorder is X-linked, males would be more likely to have the disorder because they only have one X chromosome.
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Therefore, the most likely cause is a recessive allele on an autosome. Both parents can be carriers of the recessive allele without showing symptoms of the disorder. If both parents pass on the recessive allele, the child would have the disorder.
Similar Questions
A human baby boy inherits a recessive allele from his mother. In which circumstance would he most likely show the trait coded for by the recessive allele? Group of answer choicesThe allele is on the X chromosome.The baby inherits the dominant allele from his father.The allele is on an autosomal chromosome and the baby is a twin.The allele is on the Y chromosome.
Presence of the phenotype of an autosomal recessive disorder in one generation and then absence of the phenotype in the next generation likely meansMultiple choice question.the allele is present in heterozygotes that are carrying the disorder.the disorder has mutated into another form.the allele has not been passed to the next generation.the disorder has ceased to exist in the family.
A pedigree diagram shows heterozygotes have a normal phenotype and affected children can have unaffected parents.Group of answer choicesautosomal recessive disorderautosomal dominant disorder
It requires only one affected allele in order to express that trait.Group of answer choicesautosomal dominant disorderautosomal recessive disorderNext
To inherit an autosomal dominant disorder a person could receive the allele leading to the disease fromMultiple Choicethe father only, not the mother.the mother only, not the father.the mother or the father.the parent who does not exhibit the disease.All answers are correct.
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