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Ch. 21 - Genomes and Their Evolution
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 11th EditionCh. 21 - Genomes and Their EvolutionProblema 2
Capitolo 21, Problema 2

Homeotic genes
a. Encode transcription factors that control the expression of genes responsible for specific anatomical structures.
b. Are found only in Drosophila and other arthropods.
c. Are the only genes that contain the homeobox domain.
d. Encode proteins that form anatomical structures in the fly.

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1
Understand that homeotic genes are a group of genes that regulate the development of anatomical structures in various organisms, not just in Drosophila or arthropods.
Recognize that homeotic genes encode transcription factors, which are proteins that help turn specific genes on or off by binding to nearby DNA.
Identify that these transcription factors control the expression of other genes responsible for the development of specific anatomical structures.
Note that homeotic genes are characterized by the presence of a homeobox domain, a DNA sequence that is highly conserved across different species.
Clarify that while homeotic genes encode transcription factors, they do not directly encode proteins that form anatomical structures; instead, they regulate the expression of other genes that do.

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Homeotic Genes

Homeotic genes are crucial in developmental biology as they encode transcription factors that regulate the expression of other genes, determining the identity and arrangement of anatomical structures during development. These genes are not limited to Drosophila or arthropods but are found across various species, including humans.
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05:02
Genes & Alleles

Homeobox Domain

The homeobox domain is a conserved DNA sequence found within homeotic genes, encoding a part of the protein that binds to DNA. This domain is essential for the gene's role in controlling the development of body structures, and it is present in many genes beyond just homeotic genes, indicating its widespread importance in gene regulation.
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05:20
3 Domains of Life

Transcription Factors

Transcription factors are proteins that bind to specific DNA sequences, controlling the rate of transcription of genetic information from DNA to messenger RNA. They play a pivotal role in turning genes on or off, thus influencing cell function and development, including the formation of anatomical structures as directed by homeotic genes.
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Introduction to Transcription Factors
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Domanda del libro di testo

Two eukaryotic proteins have one domain in common but are otherwise very different. Which of the following processes is most likely to have contributed to this similarity?

a. Gene duplication

b. Alternative splicing

c. Exon shuffling

d. Random point mutations

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Bioinformatics includes all of the following except

a. Using computer programs to align DNA sequences.

b. Using DNA technology to combine DNA from two different sources in a test tube.

c. Developing computer-based tools for genome analysis.

d. Using mathematical tools to make sense of biological systems.

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Domanda del libro di testo

Use a highlighter to color any amino acid that varies among the species. (Color that amino acid in all sequences.)

a. The C, G, R sequences are identical. Identify which lines correspond to those sequences.


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Use a highlighter to color any amino acid that varies among the species. (Color that amino acid in all sequences.)

b. The H sequence differs from that of the C, G, R species at two amino acids. Underline the two differences in the H sequence.

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