Question

an allele whose trait always shows up in the organism when the allele is present is called... a dominant allele a chromosome a recessive allele a gene

Explanation:

An allele is one of two or more versions of a gene. A dominant allele is expressed phenotypically even when heterozygous (paired with a different allele). In contrast, a recessive allele is only expressed when homozygous (two copies of the same recessive allele). A chromosome is a structure of DNA and proteins. A gene is a segment of DNA that codes for a trait. The description "whose trait always shows up in the organism when the allele is present" matches the definition of a dominant allele.

Answer:

a Dominant Allele