Crossing over

Linked gene need not always stay together. Shuffling of linked genes can occur resulting in production of combination of genes. This causes the production of combination of genes other than parental during crosses between the individuals. The actual shuffling of linked genes occurs during meiotic prophase. This exchange is called crossing over (CO) . Crossing over may be defined as mutual interchange of corresponding chromosomal segments between non-sister chromatids of a…

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Kinds, Frequency and Factors Affecting of Crossing over

Kinds of Crossing over

According to the number of chiasmata formed crossing over can be classified into three types- single crossing over, double crossing over and multiple crossing over.

• Single crossing over: if crossing over occurs only at a single locus in a homologous pair of chromosomes it is called single crossing over. The gametes formed as a result of single cross over are called as single cross over gametes.
• Double crossing over: when chiasmata occur at two points i…

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