why are genes called hereditary unit ?
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Answer:
The genes are called hereditary unitsas the offsprings inherit different traits of parents through genes present on chromosomes in male and female gametes.
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Mendel 's proposed laws of heredity based on transmission and breeding experiments on pea - plants. At that time nothing was known about cell biology, cell division, genes and chromosomes.
The law of heredity on theoretical assumptions was in conformity with the proposed results based on these assumptions. Mendel thus proposed the prevailing laws of heredity, that is, the law of segregation and the law of independent assortment.
With the development of knowledge on cell biology, Mendelian factors proved to be nothing but genes on chromosomes.
The rule of segregation and the law of independent assortment of medel can be easily explained by examining the behaviour of medel during the meiosis over which the genes are located.
Thus genes are called hereditary units.