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Amar Kumar 8 years, 2 months ago
Gene:A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins.
A gene is a sequence of DNA or RNA which codes for a molecule that has a function. The DNA is first copied into RNA. The RNA can be directly functional or be the intermediate template for a protein that performs a function
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Amar Kumar 8 years, 2 months ago
Earthworm has various openings and structures on ventral surface. Single median opening per segment is present towards the dorsal surface through which coelomic fluid oozes out.
Ventral side of earthworm could be identified by presence of locomotory structures, called setae . These are microscopic, present in rows.
Then there are paired openings of seminal receptacles , and male genital pores . Male genital pores are often associated with genital papillae on adjacent segments. Earthworm is hermaphroditic, so paired female genital pores are also present towards ventral side.
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An ecosystem is a community of plants, animals and smaller organisms that live, feed, reproduce and interact in the same area or environment.These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows.
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Polyembryony is the formation of more than one embryo from a single fertilized ovum or in a single seed.
Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg.Polyembryony can occur in humans, resulting in identical twins, though the process is random and at a low frequency. Polyembryony occurs regularly in many species of vertebrates, invertebrates, and plants.
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Prenatal development is the process in which an embryo and later fetus develops during gestation. Prenatal development starts with fertilization the first stage in embryogenesis which continues in fetal development until birth
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