Morphological characteristics:
The morphology of Caenorhabditis elegans is worm-like, symmetrical on both sides, covered by a stratum corneum, without segments, with four main epidermal cords and a prosthetic cavity filled with body fluids. Most members of this family have the same organs and tissues as other animals.
Caenorhabditis elegans is male and hermaphrodite, and its basic anatomical structure includes mouth, pharynx, intestine, gonad and collagen stratum corneum. Males have univalent gonads, vas deferens and a tail dedicated to mating. Androgyny has two ovaries, fallopian tubes, testicles and a uterus.
Cytological characteristics:
From the research point of view, the advantage of Caenorhabditis elegans is that it is a multicellular eukaryotic organism, which is simple enough for detailed research. Each somatic cell of Caenorhabditis elegans (there are 959 hermaphroditic adults; 103 1 The developmental fate of male adults has been established. The law of this cell lineage is almost constant among individuals.
In both sexes, many extra cells (androgyny 13 1, most of which have become neurons) will be removed through the process of apoptosis.
Life history of the beautiful fruit fly;
(1) embryonic stage
Embryogenesis can be roughly divided into two periods: proliferation period and organ and morphogenesis period. In the proliferation period, fertilized eggs will gradually proliferate from one cell to about 550 necessary undifferentiated cells, and the proliferation period can be divided into two stages.
(2) Formation period
In the growth environment of 22℃, the embryo will grow for about three times from about 5.5-5.6 hours to 12- 14 hours after fertilization, forming completely differentiated tissues and organs. According to the number of folds observed in the embryo, it can be divided into commas. Stage, 1.5 times, 2 times, 3 times and 4 times.
(3) Larval stage
Postembryonic development is initiated by food stimulation after hatching. In the case of food, cell division continues, and post-embryonic development begins three hours after hatching.
Generally speaking, Caenorhabditis elegans goes through four stages of larval stage (L 1, L2, L3, L4) to become an adult. Many embryonic cells divide in the larval stage of these four stages in an almost constant way of time and space planning, which also gives Caenorhabditis elegans a fixed number of cells and a doomed cell fate.
(4) Adult stage
In the environment of 22°C to 25°C, it will become mature intersexuality and lay its first egg about 45-50 hours after hatching. Adult sex can produce eggs for about four days. After this growth period, adults will live for another ten to fifteen days, and the intersexuality of self-fertilization will produce about 300 offspring.