Table of Contents
What are the characteristics of homeotic genes?
A homeotic protein can activate one gene but repress another, producing effects that are complementary and necessary for the ordered development of an organism. Homeotic genes contain a sequence of DNA known as a homeobox, which encodes a segment of 60 amino acids within the homeotic transcription factor protein.
What are homeotic genes and what do they do?
In evolutionary developmental biology, homeotic genes are genes which regulate the development of anatomical structures in various organisms such as echinoderms, insects, mammals, and plants.
What is the role of homeotic genes in fruit flies of the genus Drosophila?
Homeotic mutations in fruit flies Homeotic genes are responsible for determining the identity of particular segments or structures of the body.
What is the role of homeotic genes in fruit flies of the genus Drosophila quizlet?
How many homeobox genes are in Drosophila?
eight Hox genes
As shown, in Drosophila there are eight Hox genes in a row, and the genes’ order within that row reflects their order of expression in the fly body.
What is significant about the homeotic genes in many different organisms?
Homeotic genes are responsible for determining the identity of particular segments or structures of the body. So, when homeotic genes are inactivated or expressed in unusual locations due to mutations, they may cause body segments to take on new—and sometimes startling!
Which statement is correct for homeotic genes?
That’s why the mutation in homeotic genes of wings caused the formation of legs in place of wings. These genes are also called as memory genes as they serve to set the developmental fate of a segment which is followed from one cell division to the next. Thus, the correct answer is A.
Are homeotic and Hox genes the same?
Hox genes are a subset of homeotic genes. Significantly, they only occur in animals with bilateral symmetry. Therefore, they specify the development of organs of the embryo along the head-tail axis. Also, they ensure the formation of correct structures in the correct position in the body.
How many Hox genes are in Drosophila?
What does the presence of homeotic genes in fruit flies and mice indicate about their evolution?
The presence of homeobox genes in fruit flies and mice indicates a common evolutionary ancestor.
What are homeotic genes What do they have to do with animal diversity?
These genes that determine animal structure are called “homeotic genes,” and they contain DNA sequences called homeoboxes. Genes with homeoboxes encode protein transcription factors. One group of animal genes containing homeobox sequences is specifically referred to as Hox genes.