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A metazoan is a multicellar animal which possesses more than one type of cell and whose cells are organized to form tissues and organs.
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Why are Hox genes thought to play an important role in the development of different morphologies?
Hox genes are a group of related genes that specify the anterior-posterior axis and segment identity of metazoan organisms during early embryonic development. These genes are critical for the proper number and placement of embryonic segment structures (such as legs, antennae, and eyes).
How can hox genes provide evidence of evolution?
Hox genes are a group of related genes that specify the anterior-posterior axis and segment identity of metazoan organisms during early embryonic development. These genes are critical for the proper number and placement of embryonic segment structures (such as legs, antennae, and eyes). Homeotic genes are defined by a DNA sequence known as the homeobox, which is a sequence of 180 nucleotides that code for a protein domain known as the homeodomain. The protein products of homeotic genes belong to a class of proteins known as transcription factors, all of which are capable of binding to DNA, thereby regulating the transcription of genes. Just as homeotic genes regulate realisator genes, they are in turn regulated themselves by gap genes and pair-rule genes, which are in their turn regulated by maternally-supplied mRNA. This results in a transcription factor cascade: maternal turns on gap or pair-rule genes; gap and pair-rule genes turn on homeotic genes; then, finally, homeotic genes turn on realisator genes that cause the segments in the developing embryo to differentiate. Incorrect expression of homeotic genes can lead to major changes in the morphology of the individual. Homeotic mutations were first identified in 1894, when William Bateson noticed that floral stamens occasionally appeared in the wrong place; he found for example flowers in which the stamens would grow in the place where petals normally grow. In the late 1940s, Edward Lewis began studying homeotic mutation on Drosophila melanogaster which caused bizarre rearrangements of body parts. Mutations in the genes that code for limb development can cause deformity or lead to death. For an example, mutations in the Antennapedia gene cause legs to develop on the head of a fly instead of the antenna. Another famous example in the Drosophila melanogaster is the mutation of the Ultrabithorax homeotic gene, which specifies the 3rd thoracic segment. Normally, this segment displays a pair of legs and a pair of halteres (a reduced pair of wings used for balancing). In the mutant lacking functional Ultrabithorax protein, the 3rd thoracic segment now expresses the same structures found on the segment to its immediate anterior, the 2nd thoracic segment, which contains a pair of legs and a pair of (fully developed) wings. These mutants sometimes occur in wild populations of flies, and it was these mutants that led to the discovery of homeotic genes.
What is an example of a Metazoan?
Yes
Where was the metazoan jellyfish found?
in the toilet
What are the animals cells called?
Metazoan/animal cells.
Which is the first species of jellyfish found?
The first jellyfish was called the Metazoan.
What are the three common names of organisms in the phylum mollusca of the metazoan kingdom of the eukaryoti domain?
Snails Clams Squid
Why is volvox considered a protist rather than a metazoan animal?
Volvox is colonial organism as it lacks proper division of labour among cells, cells are not differentiated.
What is the first phylum with a complete digestive system?
incomplete= cniderians and platyhelminthes complete = every other metazoan. e.g. nematoda, mammals, etc
Why are Hox genes thought to play an important role in the development of different morphologies?
Hox genes are a group of related genes that specify the anterior-posterior axis and segment identity of metazoan organisms during early embryonic development. These genes are critical for the proper number and placement of embryonic segment structures (such as legs, antennae, and eyes).
What are the major evolutionary trends among the metazoan invertebrate phyla?
Perhaps the most significant evolutionary trend among the metazoan invertebrate phyla is that of cephalization. This term refers to the development of a head, containing a brain. Another process called segmentation allowed animals to develop distinct body parts, such as legs, wings and feelers.
What are some eight letter words with 1st letter M and 3rd letter T and 5th letter Z and 7th letter A?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern M-T-Z-A-. That is, eight letter words with 1st letter M and 3rd letter T and 5th letter Z and 7th letter A. In alphabetical order, they are: metazoal metazoan
What are some eight letter words with 1st letter M and 3rd letter T and 6th letter O and 7th letter A?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern M-T--OA-. That is, eight letter words with 1st letter M and 3rd letter T and 6th letter O and 7th letter A. In alphabetical order, they are: metazoal metazoan
What Most of the living species known to science are?
Over half of all known species on earth are insects (from the Latin insectum, which means "cut into sections") The number of current species is estimated between six and ten million, and could represent over 85% of metazoan life forms on the planet. Insects are found in almost every environment, although few insect species live in the ocean.
