One form of a gene -Example: The dominant allele (B) or recessive allele (b) Chromosome allele

The question is asking for the term that describes one form of a gene. In genetics, genes come in different versions, which are called alleles. Each individual inherits two alleles for each gene, one from each parent. These alleles can be the same (homozygous) or different (heterozygous). The terms "dominant allele" and "recessive allele" refer to the expression of the allele. A dominant allele is one that will express its trait even if only one copy is present (in a heterozygous individual), while a recessive allele will only express its trait if two copies are present (in a homozygous individual). The term "chromosome" refers to the structure that contains many genes, not a single form of a Therefore, the correct term that describes one form of a gene is "allele."