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Chapter 18: Problem 8

List the main classes of zygotic genes. What is the function of each class of these genes?

Short Answer

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Question: List the main classes of zygotic genes and describe their function. Answer: The three main classes of zygotic genes are maternal effect genes, segmentation genes, and homeotic genes. Maternal effect genes are important for establishing the body axes during early development and controlling the localization of cellular structures. Segmentation genes are responsible for the formation and positioning of body segments, dividing the embryo into distinct parts along the anterior-posterior axis. Homeotic genes determine the identity and development of body segments, organs, and tissues, helping maintain the proper organization of the body plan.

Step by step solution

01

Define Zygotic Genes

Zygotic genes, also known as zygotic-effect genes, are genes that are activated in the zygote, which is the first diploid cell formed by the fusion of two haploid gametes during fertilization. These genes are important for the regulation of early development and cellular processes in multicellular organisms such as animals and plants.
02

List the Main Classes of Zygotic Genes

There are three main classes of zygotic genes: 1. Maternal effect genes 2. Segmentation genes 3. Homeotic genes
03

Function of Maternal Effect Genes

Maternal effect genes are a specialized class of zygotic genes derived from the mother. These genes are important during the early development of the embryo, as they help in establishing the anterior-posterior (head-tail) and dorsal-ventral (back-belly) axes. In some organisms, these genes play a crucial role in controlling the initial localization of cellular structures and organelles to ensure proper embryonic patterning and development.
04

Function of Segmentation Genes

Segmentation genes are responsible for the formation and positioning of body segments in the developing organism. These genes are essential in controlling the organization of cells along the anterior-posterior axis, dividing the embryo into distinct segments. They establish the basic body plan and help create a blueprint for the future development of the organism. Segmentation genes can be further divided into three sub-groups: 1. Gap genes: Define the broad regions along the anterior-posterior axis. 2. Pair-rule genes: Regulate the development of alternating segments. 3. Segment polarity genes: Determine the anterior-posterior organization within each segment.
05

Function of Homeotic Genes

Homeotic genes are a group of zygotic genes that determine the identity and development of body segments, organs, and tissues in multicellular organisms. These genes control the unique development of each body part and help maintain the proper organization of the body plan. Homeotic genes encode transcription factors, which are proteins that bind to specific DNA sequences and regulate the activity of other genes. The most well-known homeotic genes are the Hox genes, which play a crucial role in determining the overall body plan in animals.

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Most popular questions from this chapter

How can you determine whether a particular gene is being transcribed in different cell types?

Carefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?

(a) What are zygotic genes, and when are their gene products made? (b) What is the phenotype associated with zygotic gene mutations? (c) Does the maternal genotype contain zygotic genes?

(a) What are maternal-effect genes? (b) When are gene products from these genes made, and where are they located? (c) What aspects of development do maternal-effect genes control? (d) What is the phenotype of maternal-effect mutations?

Experiments have shown that any nuclei placed in the polar cytoplasm at the posterior pole of the Drosophila egg will differentiate into germ cells. If polar cytoplasm is transplanted into the anterior end of the egg just after fertilization, what will happen to nuclei that migrate into this cytoplasm at the anterior pole?
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