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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.
Explain which is better to grow plants in Rock sand or soil? Ans) When we grew plants inside, with no wind, and the plants in the rocks grew superior to the plants that were gr
Explain about colloidal system A colloidal system, on the other hand, is a heterogeneous system. The material that forms the base of the system is called the dispersion medium
Histogenesis and Organogenesis After the octant stage numerous cell divisions occur in various planes. The proembryo become globular or bulb-shaped. As a general rule, some ta
A charged particle A exerts a force of 2.39uN to the right on charged particle B when the particles are 12.3 mm apart. Particle B moves straight away from A to make the distance be
explain hadzi''s theory with reference to metazoa
As we have seen, in during epinephrine hormonal control or glucagon, dephosphorylated phosphorylase kinase is activated by being phosphorylated by protein kinase. This then a
In which bones can bone marrow chiefly be found? Is the bone marrow made of osseous tissue? Bone marrow can mostly be found in the internal cavities of flat bones, as the verte
Motor nerves : Nerves which carry impulses from brain or spinal cord to effector organs are called efferent or motor nerves. Stimulation of motor nerves makes the muscles to contr
Culture Medium - Techniques of Plant Tissue Culture In nature green plants are capable of synthesizing organic compounds necessary for their growth and development from the mi
Phosphorylation is the addition of the phosphate monoester to a macromolecule, catalyzed by a particular kinase enzyme. With respect to the proteins, particular amino acid side ch
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