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

What is coevolution, What is Coevolution ? There is considerable eviden...

What is Coevolution ? There is considerable evidence that supports an interesting theory that two individual species can affect each others evolution in reciprocal fashion. In

What is the main nitrogen waste of humans, Q. What is the main nitrogen was...

Q. What is the main nitrogen waste of humans? Human beings excrete largely urea eliminated with the urine.

Define water distribution and compartments of body water, Define Water Dist...

Define Water Distribution and Compartments of Body Water? Each one of us has a veritable 'sea within', held in place by multiple membranes and our protective envelope of skin.

Evolution of heart in higher animals, Evolution of heart in higher animals ...

Evolution of heart in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. Th

Explain the bioavailability of nicotinic acid, Explain the Bioavailability ...

Explain the Bioavailability of Nicotinic Acid? We have already learnt earlier that niacin is provided in the diet primarily as the pyridine nucleotides-NAD and NADP. In additio

Homeostasis, HOMEOS T ASI S - Homeo = same,   Stasis = state Li...

HOMEOS T ASI S - Homeo = same,   Stasis = state Living beings maintain their internal environment by self regulating system, it is called homeostasis. Term coined by

Disposal-lab animals, Disposal : Opaque bags are the recommended for dispo...

Disposal : Opaque bags are the recommended for disposing off carcasses. You should also put freshly dissected animals and tissues into opaque plastic bags, seal them and dispose t

Can you explain mitotic apparatus, Q. What is mitotic apparatus? Mitoti...

Q. What is mitotic apparatus? Mitotic apparatus is the set of aster fibers, radial structures around each centriole pair, plus the spindle fibers, fibers that extend across the

Explain prodecures of antimicrobial prophylaxis, Antimicrobial prophylaxis ...

Antimicrobial prophylaxis Antimicrobial prophylaxis is generally not indicated for cardiac catheterization, varicose vein surgery, most dermatologic and plastic surgery, arteri

Effects on plants of air pollutants, Effects on plants of Air pollutants ...

Effects on plants of Air pollutants SO 2 , O 3 and NO 2 are strong oxidants and can bring about significant changes in plant cell chemistry. The general effects of pollutant

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