Final answer:
False. Chromosome regions rich in 5-methyl cytosine are not lacking in gametes.
Step-by-step explanation:
False. Chromosome regions rich in 5-methyl cytosine (a type of DNA methylation) are not lacking in gametes. DNA methylation is an epigenetic modification that can occur on cytosine residues in DNA. It is involved in gene regulation and plays a role in various processes including embryonic development and imprinting. While some regions of DNA may be more methylated in gametes compared to non-gamete cells, it does not mean that these regions are completely lacking in gametes. DNA methylation patterns can be different in different cell types or developmental stages.