Biology - meiosis - crossing over

Biology
Tutor: None Selected Time limit: 1 Day

Describe two evolutionary consequences if the process of crossing over in meiosis did not occur.

Aug 9th, 2015

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crossing over is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes during sexual reproduction. It is one of the final phases of genetic recombination which occurs in the pachytene stage of prophase I of meiosis during a process called synapsis.Without recombination, all alleles for those genes linked together on the same chromosome would be inherited together.

*Crossing over is important because it results in new combinations of genes that are different from either parent, contributing to genetic diversity. so this will help an organism to reproduce off springs with beter traits.

*It is also important to note that crossing over occurs at a random point and more than one chiasma can form per homologous pair. This means that meiosis can result in almost an infinite amount of genetic variety. By new variations there'll be less chances of disorders related to sex-linked inheritance.


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Aug 9th, 2015

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