Final answer:
The type of allele that likely causes the indicated trait in a pedigree chart cannot be determined without the chart. However, it could be X-linked dominant or recessive, autosomal dominant or recessive, depending on several factors.
Step-by-step explanation:
From the absence of the trait pedigree chart, we can still infer some insight based on general genetics principles. X-linked dominant traits, for instance, materialize in male and female offspring depending on whether the affected gene comes from the father or the mother. Whereas, an autosomal dominant trait will manifest in an individual if they have at least one copy of the dominant allele.
X-linked recessive disorders, on the other hand, are more frequently seen in males, as they have only one X chromosome and thus do not require two copies of the recessive allele for the trait to be expressed. Females have two X chromosomes, so they must inherit two copies of the recessive allele to express an X-linked recessive trait. Females who carry one copy of the recessive allele can pass the trait on to their children.
In the case of autosomal recessive traits, they are only expressed when two copies of the recessive allele are present, regardless of the individual's gender. Therefore, without the pedigree chart, it's impossible to accurately determine the type of inheritance in question.
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