Final answer:
The number of colored disks used to represent each critter's genes for tail color depends on the critter's genetics.
Step-by-step explanation:
Based on the reading about reproduction, the correct answer is d) It depends on the critter's genetics. The number of colored disks used to represent each critter's genes for tail color will vary depending on the specific genetics of the critter. Some critters may have two copies of each gene (b. haploid with two copies of each gene), some may have four copies of each gene (d. diploid with four copies of each gene), while others may have three copies of each gene (c. diploid with three copies of each gene).