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Cleavage (Segmentation)
Cleavage (Segmentation) - Cleavage is an unique embryological process which transforms the single fertilised egg cell into a sphere of closely aggregated multitude of cells. Immediately after fertilisation the fertilised ovum (egg cell) undergoes a series of cell divisions. These division..
Cleavage (Segmentation) - Cleavage is an unique embryological process which transforms the single fertilised egg cell into a sphere of closely aggregated multitude of cells. Immediately after fertilisation the fertilised ovum (egg cell) undergoes a series of cell divisions. These division..Cleavage (Segmentation)
Cleavage is an unique embryological process which transforms the single fertilised egg cell into a sphere of closely aggregated multitude of cells. Immediately after fertilisation the fertilised ovum (egg cell) undergoes a series of cell divisions. These divisions are called cleavage division..
Phylum Annelida (Segmented Worms)
Phylum Annelida (Segmented Worms) - Earthworm Occur in moist soil, fresh water and sea. Body is soft and segemented, triploblastic with bilateral symmetry. First animal with the coelom (body cavity). Body is covered by a non-chintinous cuticle which may have chitinous setae, or parapodia...
Phylum Annelida (Segmented Worms) - Earthworm Occur in moist soil, fresh water and sea. Body is soft and segemented, triploblastic with bilateral symmetry. First animal with the coelom (body cavity). Body is covered by a non-chintinous cuticle which may have chitinous setae, or parapodia...Return of DNA Segment to Original Form
As the RNA chain grows, the transcribed region of the DNA molecule gets hydrogen bonded to the opposite strand and the two become spirally coiled to assume the original double helical form. When the last ribonucleotide is added, the RNA polymerase and RNA chain are completely released from the DNA..
Artificial Synthesis of DNA
Artificial Synthesis of DNA on Template - In 1961, Kornberg and his coworkers synthesized DNA from a mixture of deoxyribonucleoside triphosphates, DNA polymerase enzyme, metal ions and a segment of viral DNA functioning as a primer. The synthetic DNA showed biological activity. ..
Integumentary Nephridia
These lie attached to the inner side of the body wall in all segments except the first t..
Polarity in Regeneration
The body segments of Hydra or planarians exhibit distinct polarity during regeneration. Their anterior end always regenerates into head and posterior into the ta..
Inversion
When a segment of chromosomes breaks but later rejoins after rotating by 180 o it result in inversion. If the centromere is included in the inverted segment, it is known as pericentric but of inversion occurs only in one arm and the centromere is not involved, it is referred a..
Phylum Arthropoda (Animals with Jointed Legs)
This is the largest phylum with almost 80% of the animals kingdom in this phyla. Body is bilaterally symmetrical and segmented. It is divided into head, thorax and abdome..
Phylum Annelida
Free-living, terrestrial or aquatic form (freshwater or marine). Body is long, cylindrical and metamerically segmented..
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