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Chapter 5: Problem 2

Describe the inheritance pattern of maternal effect genes. Explain how the maternal effect occurs at the cellular level. What are the expected functional roles of the proteins that are encoded by maternal effect genes?

Short Answer

Expert verified
Maternal effect genes are those whose expression in a mother's egg directly affects the phenotype of her offspring regardless of the offspring's genotype. At the cellular level, the proteins, encoded by maternal effect genes and produced during oogenesis in the mother's body, are crucial for early embryonic development such as cell division, cell differentiation, and body plan formation.

Step by step solution

01

Understanding Maternal Effect Genes

Maternal effect genes are those in which the genotype of the mother directly determines the phenotype of her offspring, regardless of the offspring's genotype. This happens because the mother's gene is expressed during oogenesis contributing to the egg cytoplasm, and influences the development of the offspring.
02

Maternal Effect at the Cellular Level

During oogenesis, the mother's cells produce mRNA and proteins derived from the mother's genotype. These molecules are then incorporated into the egg's cytoplasm. After fertilization, during the initial stages of embryogenesis, the embryo relies on these maternal supplies for initial development as the embryonic genes are not yet activated.
03

Functional Roles of Proteins Encoded by Maternal Effect Genes

The proteins encoded by maternal effect genes generally play key roles in early embryonic development. They are involved in processes such as cell division, differentiation, and the establishment of body plan. A failure in these proteins may result in developmental defects or failure in embryo development.

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Most popular questions from this chapter

Describe the molecular process of X-chromosome inactivation. This description should include the three phases of inactivation and the role of the Xic. Explain what happens to the X chromosomes during embryogenesis, in adult somatic cells, and during oogenesis.

Suppose a maternal effect gene exists as a functional dominant allele and a nonfunctional recessive allele. A mother who is phenotypically abnormal produces all normal offspring. Explain the genotype of the mother.

Explain why maternal effect genes exert their effects during the early stages of development.

When does the erasure and reestablishment phase of genomic imprinting occur? Explain why it is necessary to erase an imprint and then reestablish it in order to always maintain imprinting from the same sex of parent.

Discuss the structure and organization of the mitochondrial and chloroplast genomes. How large are they, how many genes do they contain, and how many copies of the genome are found in each organelle?
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