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Q. What is the crossing over? And In which period of meiosis does this event occur?
Crossing over is the eventual exchange of chromosomal fragments among homologous chromosomes. The phenomenon takes place in prophase I when homologous chromosomes are paired. Crossing over is of great importance for biodiversity and evolution since it provides recombination of alleles of different genes linked in the same chromosome during cell division by meiosis.
In the previous sub-section we discussed the possible ways by which variabiliti can, be generated. We shall now examine one instance that illustrates the consequence of variability
What is Nagel's Anomaloscope The patient is asked to match a yellow with a mixture of red and green wave lengths. A defect can be detected based on the amount of red and green
The test for limestone You can check the rock samples to see if any are limestone by dropping lemon juice, vinegar or some other dilute acid on them. If any are limestone they
Q. What is transgenic food? The Transgenic beings are animals, microorganisms and plants that contain recombinant DNA that is genes from other microorganisms, plants or animals
What is the vector of Chagas' disease? How is the disease transmitted? The vector of Chagas' disease is its middle host, a triatomine bug. The major species is Triatoma infesta
Q. What are the main risk factors for hypertension? The major risks factors for hypertension are tobacco smoking, stress, obesity, sedentary lifestyle and alcoholism.
Differential reinforcement of low response rate (DRL) This is used to encourage low rates of responding. Example: "If you ask me for a potato chip no more than once every 10 mi
Modalities Available for Sterilization The most accepted methods of sterilization can be classified as follows: Physical Agents: These comprise of: Sunlight Drying
Q. What is the ecological role of earthworms? Earthworms have an important ecological role as they eat decomposing organic material. They also dig tunnels in the subsoil allowi
Specific Gravity The density of a substance is defined as mass per unit volume. The density of a substance is a characteristic property and has a definite value at a given te
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