Textbook Question
What is the phenotype of maternal-effect mutations?
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Ch. 23 - Developmental Genetics
Klug12th EditionConcepts of Genetics ISBN: 9780135564776
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Table of contents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Chapter 23, Problem 7c
Does the maternal genotype contain zygotic genes?
Verified step by step guidance1
Understand the difference between maternal effect genes and zygotic genes. Maternal effect genes are expressed in the mother and their products (mRNA or proteins) are deposited into the egg, influencing early development. Zygotic genes, on the other hand, are expressed in the embryo itself after fertilization.
Clarify that the maternal genotype refers to the genetic makeup of the mother. It determines the maternal effect genes that contribute to the egg's environment but does not directly include zygotic genes.
Explain that zygotic genes are activated in the embryo after fertilization and are derived from the combination of maternal and paternal alleles. These genes are not part of the maternal genotype but are influenced by it.
Highlight that maternal effect genes can regulate the expression of zygotic genes during early development, creating a connection between the maternal genotype and the zygotic genes' activity.
Conclude that while the maternal genotype does not contain zygotic genes, it plays a crucial role in setting up the conditions for zygotic gene expression in the developing embryo.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Maternal Genotype
The maternal genotype refers to the genetic makeup of the mother, which includes all the alleles present in her DNA. This genotype can influence the traits of the offspring through the genes that are passed on during fertilization. Understanding the maternal genotype is crucial for studying inheritance patterns and the expression of traits in the zygote.
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Maternal Effect
Zygotic Genes
Zygotic genes are the genes that are expressed in the zygote, which is the fertilized egg formed from the union of sperm and egg. These genes are derived from both the maternal and paternal genotypes. The expression of zygotic genes is essential for the development of the embryo and can determine various phenotypic traits in the offspring.
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Gene Expression
Gene expression is the process by which information from a gene is used to synthesize functional gene products, typically proteins. In the context of zygotic development, gene expression is regulated by both maternal and paternal contributions, influencing the growth and differentiation of the zygote. Understanding gene expression is vital for comprehending how traits are inherited and manifested in the offspring.
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Related Practice
Textbook Question
What are zygotic genes, and when are their gene products made?
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Textbook Question
What is the phenotype associated with zygotic gene mutations?
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Textbook Question
List the main classes of zygotic genes. What is the function of each class of these genes?
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Textbook Question
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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Textbook Question
How can you determine whether a particular gene is being transcribed in different cell types?
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