Final answer:
In a double heterozygote, the alleles are arranged in the trans configuration when the alleles from each gene are found on different chromosomes. This arrangement allows for genetic recombination and the creation of different combinations of alleles in the offspring.
Step-by-step explanation:
In a double heterozygote, the alleles are arranged in the trans configuration when the alleles from each gene are found on different chromosomes. This means that one allele from each gene is present on one chromosome, while the other allele from each gene is present on the other chromosome. This arrangement occurs during the process of meiosis when homologous chromosomes exchange genetic material through a process called crossing over.
For example, let's say we have two genes, A and B, with the alleles A and a for gene A, and B and b for gene B. In the trans configuration, one chromosome could have the alleles A and B, while the other chromosome could have the alleles a and b. By having the alleles arranged in the trans configuration, it allows for the possibility of genetic recombination and the creation of different combinations of alleles in the offspring.