Explain crossing over in genetics, Biology

Assignment Help:

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.

 


Related Discussions:- Explain crossing over in genetics

Functions of cerebrum, Functions of cerebrum The forebrain is otherw...

Functions of cerebrum The forebrain is otherwise called as ‘cerebrum'. It is highest centre for controlling several functions in the body, The most interesting aspect

Determine the subordinate distinctions horizons, Subordinate Distinctions ...

Subordinate Distinctions In addition to the above mentioned designations, master horizons are further characterised by specific properties such as distinctive colour or the ac

Explain the leydig cells, In an adult male, which of the following is true?...

In an adult male, which of the following is true? A. The plasma membranes of Leydig cells contain LH receptors. B. The plasma membranes of Sertoli cells contain FSH receptor

State the red blood cells in the body capillaries in a leg, Which of the fo...

Which of the following will lead to a decrease in the amount of oxygen delivered to the body cells in a leg? A. A decrease in hydrogen ion concentration in red blood cells in t

What are the differences between mitosis and meiosis, Concerning their fina...

Concerning their final products (daughter cells and their ploidies) what are the differences between mitosis and meiosis? In mitosis one cell, for example, with 2n chromosomes,

Colonial theory - metazoa, Colonial Theory - Metazoa  This is the most...

Colonial Theory - Metazoa  This is the most popular theory on the origin of Metazoa. The idea was conceived by Haeckel (1874) modified by Metschnikoff (1886) and revived by Hy

Roles of fatty acid, Fatty acids have four main biological roles: 1.  Th...

Fatty acids have four main biological roles: 1.  They are used to create sphingolipids and glycerophospholipids which are necessary elements of biological membranes; 2.  Nume

Enzyme activity, Enzyme Activity Enzymes are biomolecules which catalyz...

Enzyme Activity Enzymes are biomolecules which catalyze (i.e. increase the rates of) chemical reactions. Almost all enzymes are proteins. In enzymatic reactions, the molecules

What are the types of proteins in metabolism of lens, What are the types of...

What are the types of proteins in metabolism of lens? Soluble Proteins Its synthesis takes place in the equatorial part on the surface of lens. a. Alpha crystallins

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd