Comparison Between Gene and Chromosome Behaviour

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Notes

Comparison between gene and chromosome behaviour:

Around twentieth-century cytologists established that generally, the total number of chromosomes is constant in all cells of a species. A diploid eukaryotic cell has two haploid sets of chromosomes, one set from each parent. All somatic cells of an organism carry the same genetic complement. The behaviour of chromosomes during meiosis not only explains Mendel’s principles but leads to new and different approaches to study about heredity.

Comparison of chromosome and gene behaviour

Notes

Parallelism between Mendelian factors and chromosomal behaviour:

Mendelian factors Chromosomes behaviour
Alleles of a factor occur in pair Chromosomes occur in pairs
Similar or dissimilar alleles of a factor separate during the gamete formation The homologous chromosomes separate during meiosis
Mendelian factors can assort independently The paired chromosomes can separate independently during meiosis but the linked genes in the same chromosome normally do not assort independently.
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