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Chapter 26: Problem 12

With regard to development, what are the roles of the maternaleffect genes versus the zygotic genes? Which types of genes are needed earlier in the development process?

Short Answer

Expert verified
Maternal effect genes inherited from the mother govern the initial cell divisions and structure formations after fertilization and are needed earlier in the development process. Zygotic genes, a combination of maternal and paternal genes, activate after fertilization and further the developmental process. Consequently, maternal effect genes set the initial blueprint for the development process, with zygotic genes taking control after the initial stages.

Step by step solution

01

Understanding Maternal Effect Genes

Maternal effect genes are the genes that are inherited from the mother. The proteins and mRNA from these genes are stored in the egg cytoplasm before fertilization. They govern the initial cell divisions and structure formation after fertilization and thus are required early in the process of development.
02

Understanding Zygotic Genes

The zygotic genes are the genes that become activated after fertilization and are a combination of both maternal and paternal genes. These genes start functioning after the initial development stages dictated by maternal effect genes. They further refine cell diversification and lead the developmental process ahead.
03

Identifying which genes are needed earlier

As per their roles, maternal effect genes are needed earlier in the development process. They set the basic blueprint for the development process to initiate and proceed whereas zygotic genes take over after the initial stages have been completed.

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