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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.
HISTORY OF THE CELL Term "Cytology" was given by Hertwig , he also wrote a book on " Cell and Tissue ". Father of cytology = Robert Hooke. Father of Modern cytology
how many species of protozoan?
Problem of Polarity in Regeneration in Planarians As in Hydra, flatworm regeneration as well appears to occur in a polar fashion. There seems to be ananterior-posterior gradie
State about osteogenesis Embryologically, osteogenesis may be classified as either intramembranous or endochondral. When the ossification occurs directly, it is defined as intr
Functions of Plasma Proteins The proteins of the plasma serve several important functions. They exert osmotic pressure varying from 25 to 30 mm Hg, which regulate
Describe different animal groups a) Could comprehensively compare and contrast the behaviours exhibited by social animals rather than describe different animal groups
what is cell?
What is reduction? The most commonly understood definition of reduction is the removal of oxygen or addition of hydrogen ions. However, chemically, reduction can be defined as
Q. From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer? Epidermis and nervous system have the s
Q. How is the transport of substances done across the bryophyte tissues? How is this feature related to the general size of these plants? In bryophytes there are no nutrient-co
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