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Explain Crossing Over in genetics?
Crossing over is when the arms of homologous chromosomes exchange segments (and therefore genes) with each other. Recall that one of the homologues originally came from the father's sperm and the other came from the mother's egg.
During Prophase I of Meiosis the homologous chromosomes pair up to form a tetrad. The arms of the chromatids overlap, and can sometimes swap portions. This exchange results in a genetic recombination of the parental genes, providing for genetic variation, the raw material for evolution.
POULTRY BREEDING Poultry breeding has acquired pre-eminence over all other domesticated livestock enterprises. Production level of layer and broiler type of chicken touched spe
Modalities Available for Sterilization The most accepted methods of sterilization can be classified as follows: Physical Agents: These comprise of: Sunlight Drying
life cycle of ascomycota
Elaborate Extracorporial in detail. Outside of the body. An example is extracorporial digestion found in some animals where digestive enzymes are regurgitated into food. Once i
As we age, our skin wrinkles due to change in collagen and elastic fibers in the dermis and a decrease in their production. Explain why topical application of collagen and elastic
Q. What are the main causes of the loss of biological diversity nowadays? The largest dangers to the biological diversity today are the action of humans. The major of them is t
Pollen Tube Structure The pollen tube in the stigma is filled with cytoplasm containing numerous mitochondria and dictyosomes. The number of dictyosome cisternae is reduced i
Supply of Animals: Lab animals must be obtained from accredited dealers and by accredited dealers, we mean suppliers in the business of supplying animals for lab use, and not from
What are important terms in accommodation and convergence? Accommodation and Convergence In this section some important terms are included: a. How a person is able to foc
What is phellogen? What is its function? Phellogen, also called as cork cambium, is the meristematic plant tissue responsible for the formation of the periderm (the covering of
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