Are there homeotic genes in plants?
Homeotic genes homologous to those of Drosophila were later found in a wide range of organisms, including fungi, plants, and vertebrates. In vertebrates, these genes are commonly referred to as HOX genes.
How do homeotic genes regulate development?
Homeotic genes often encode transcription factor proteins, and these proteins affect development by regulating downstream gene networks involved in body patterning. Mutations in homeotic genes cause displaced body parts (homeosis), such as antennae growing at the posterior of the fly instead of at the head.
What are floral homeotic genes?
Introduction. The simple and elegant ABCE model for flower development [1], [2] gave specific predictions about where the A, B, C, and E genes, also referred to as “floral homeotic genes”, are active within a flower that consists of four concentric whorls of floral organs.
Which homeotic gene mutation S A B and or C will result in sterile plants?
Which homeotic gene mutation(s), A, B, or C ,will produce sterile plants and why? The gene mutations of B & C will produce sterile plants because they control the stamen and carpel, which are the reproductive organs of the plant.
What controls homeotic genes?
Most animal homeotic genes encode transcription factor proteins that contain a region called the homeodomain and are called Hox genes. Hox genes are turned on by a cascade of regulatory genes; the proteins encoded by early genes regulate the expression of later genes.
What regulates homeotic genes?
Homeotic genes of the Antennapedia and bithorax complexes control Drosophila development by encoding DNA-binding proteins that regulate the transcription of target genes.
What will happen to a flower if the B class genes are suppressed during flower development?
Some monocotyledonous species, including liliaceous ones, produce flowers with petaloid tepals in whorls 1 and 2. Transgenic plants with suppressed B class genes produced sepaloid tepals in whorls 1 and 2 instead of the petaloid tepals as expected.
What is the foliar theory?
Goethe’s foliar theory was formulated in the 18th century and it suggests that the constituent parts of a flower are structurally modified leaves, which are functionally specialized for reproduction or protection.
What flower structures would you expect to see in an Arabidopsis plant that is lacking AB and C genes?
In plants lacking all A, B, and C function, the floral organs develop as leaves.
How are homeotic genes in Drosophila regulated?
What is the role of homeotic genes in Drosophila?
Homeotic genes control the final determination of individual segments into structures in a Drosophila embryo. An example of a fly with a homeotic gene mutation would be a fly that has segments that developed into legs instead of antennae.