- 行业: Agriculture
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The dose that is lethal to 50% of the test animals or micro organisms in a given time period. It is usually expressed in milligrams of insecticides per kilogram of body weight in mammals, and micrograms of insecticides per gram of body weight in insects. The lower the LD value, the higher the toxicity.
Industry:Agriculture
First, second, and third generations following exposure to a mutagenic agent.
Industry:Agriculture
The expressed character (defined) due to one or some pairs of genes that have a major effect which can be dominant, recessive or intermediate.
Industry:Agriculture
1). Law of independent segregation: Hereditary traits are determined by discrete factors (now known as genes) that appear in pairs, one of each pair being inherited from each parent. During meiosis, the pairs of factors are separated or segregated. Hence, each gamete that is produced by an offspring at maturity contains only one member of each pair that the offspring produces. 2). Law of independent assortment: When two pairs of alleles are brought together in a hybrid combination, they will segregate independently from each other in the F2 itself.
Industry:Agriculture
A chain of single-stranded ribonucleotides that codes for a specific protein. Product from DNA by transcription which serves as the information carrier for translation into proteins in the ribosomes..
Industry:Agriculture
Photosynthetic aquatic biomass; the mass of plants and algae which photosynthesize in the water.
Industry:Agriculture
potential evapotranspiration; the loss of moisture by direct evaporation and transpiration from vegetation; a pressure measured in mm.
Industry:Agriculture
