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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.
a) How does the Hardy- Weinberg's expression (p²+2pq+q² =1) Describe that genetic equilibrium is maintained in a population? (b) List any two factors that can disturb the ge
difference between the respiration occurs in lower and higher organisms
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Elsie is 75 and enjoys attending the women's Institute and doing volunteer work in a local charity shop for a hospice. She is finding herself forgetting small things, and can't alw
In systematic four types of relationships are studied and they are: a) Relationships of phylogeny (evolutionary descent) or the degree to which two organisms are thought to be r
Vegetative Development - Development The process of growth and differentiation of cells into organs and organisms is often termed development. For example, the development of
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Life S cience is originated from latin word scientia , which means knowledge . Biology is a branch deals with living beings. Biology word is originated from t
Gastro Epiploic artery GEA is seldom used now. Patency has been reported as 94 per cent at one year, 88 per cent at five years and 83 per cell1 at ten years. Inferior Epiga
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