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

How calcium prevents luxury consumption of potassium, How calcium prevents ...

How calcium prevents luxury consumption of potassium Increasing Ca:K ratio in soil solution depresses the uptake of potassium. Thus one of the harmful effects of over liming m

Oogenesis in mammals, Oogenesis in Mammals In mammals also the oogoni...

Oogenesis in Mammals In mammals also the oogonial cells are derived from primordial germ cells. The multiplication phase, that is all of the oogonial divisions and transforma

Pressure flow mechanism for translocation, experiments that support pressur...

experiments that support pressure flow as a mechanism for translocation

Explain the observation or inference for seliwanoff test, Explain the Obser...

Explain the Observation or Inference for seliwanoff's test? 1. Wine or cherry red colour seen. Wine red colour confirms the presence of a ketose sugar. Note: On overheating

Breifly describe the menstrual cycle, Breifly describe the Menstrual Cycle?...

Breifly describe the Menstrual Cycle? Each month during a female's reproductive years, the hypothalamus secretes a hormone that stimulates the anterior lobe of the pituitary gl

Use of alternate metabolic pathways, Use of Alternate Metabolic Pathways ...

Use of Alternate Metabolic Pathways Plants surviving under water-logged conditions offer the simplest example of such a response. The submerged parts of such plants use the an

What is ridge morphology, What is Ridge morphology The implant-supporte...

What is Ridge morphology The implant-supported prosthesis is affected by the ridge morphology especially implant-supported overdentures which gain dual support from implants an

What are the uses of squid fins, What are the uses of squid fins? Fins ...

What are the uses of squid fins? Fins are used by squids to move at low speeds. Their siphon is used when they require moving quickly.

Five kingdom classification, discuss the merits nd demerits of five kingdom...

discuss the merits nd demerits of five kingdom classification.

Is there respiratory pigment in the annelid blood, Q. Is there respiratory ...

Q. Is there respiratory pigment in the annelid blood? The blood in beings of the phylum Annelida contains the respiratory pigment hemoglobin the same found in chordates and oth

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