Alleles areALinked genesBAlternate forms of genesCHomologous chromosomesDChromosomes that have crossed overAnswer: B. Alternate forms of genes Read Explanation: A variable form of a gene is known as an allele. Some genes exist in several distinct versions, all of which are found at the same genetic locus on a chromosome. Humans are referred to as diploid organisms because they have two alleles at each genetic locus, one from each parent. Read more in App