Mr 10 Divergence Betwixt Linkage As Well As Crossing Over

Linkage: T.H. Morgan performed a serial of experiments amongst Drosophila (1910-1914). He showed that 2 genes were found inwards coupling stage (cis) or repulsion stage (trans), because these were acquaint on the same chromosome pair. Such genes are called linked genes in addition to the phenomenon was called linkage.
The genes on a given chromosome cannot assort independently in addition to are called linked genes. The nation of many genes existence acquaint on the same chromosome is called Linkage.
The publish of linkage groups for whatever organism is equal to the haploid chromosome number. In adult man the publish of linkage groups is 23, corresponding to the chromosome publish n=23. Drosophila has 4 linkage groups.
Crossing Over: Recombination results from crossing over. The procedure of crossing over occurs yesteryear a machinery called breakage in addition to reunion theory (Darlington; 1937) in addition to comprises iv steps: synapsis, tetrad formation, crossing over in addition to disjunction.
Morgan performed a serial of experiments amongst MR X Difference betwixt Linkage in addition to Crossing Over
During prophase of meiosis I chromosomes physically telephone commutation their segments. At zygotene homologous chromosomes are brought together in addition to they are synapsed (side to side pairing). Each homologue has 2 chromatids at this stage. At pachytene chromatids telephone commutation segments, resulting crossover types.
Linkage vs Crossing Over
Linkage
1. It is style of genes on a chromosome to rest together in addition to passed equally such inwards adjacent generation.
2. It brings to a greater extent than parental types.
3. Strength of linkage betwixt 2 genes increases if they are closely placed on a chromosome.
4. With increment inwards age, link historic menstruum increases
5. It helps to hold a newly improved variety.
Crossing Over
1. It is telephone commutation of genes or chromosomal parts to interruption established linkages in addition to formation of novel linkages.
2. It produces recombinations.
3. Frequency of crossing over betwixt 2 genes decreases if they are closely placed.
4. Crossing over decreases.
5. It is the root of variations for producing novel varieties.

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