Final answer:
Injection of the gene PITX2 into the right side of a developing embryo can randomize the normal asymmetric distribution of organs, which is part of the study of left-right asymmetry in vertebrate embryology.
Step-by-step explanation:
The question involves the gene PITX2, which is significant in determining the left-right asymmetry in developing embryos. When PITX2 is injected into the right side of a developing vertebrate embryo, it can disrupt the normal asymmetric distribution of organs, leading to randomization of the asymmetry. This effect can be illustrated in certain species where PITX2 expression is critical for determining the position of organs within the body cavity. The example given in the reference, of the tortoiseshell phenotype in cats, is related to embryonic inactivation of one of two different X chromosomes, which although not directly related to PITX2, provides an example of how genetic expression can influence physical traits.