Original Post - First: Explain how one of Mendel\'s postulates is explained by o

Question

Original Post - First: Explain how one of Mendel's postulates is explained by one or more stages of meiosis. Be very specific when describing particular chromosomes and particular stages of meiosis.

Second: Find a specific example of something that happens during meiosis that would change Mendel's expected ratio of phenotypes in the next generation (the trait does not have to be found in peas; it can be any trait in any organism that produces an unusual hereditary pattern). Be sure to cite your source and include a link or copy/paste a direct quotation from your source.

Explanation / Answer

Hi,
The Mendel laws work flawlessly in many conditions. THe most important aspect of mendelism is independent assortment and segregation. The segregation occurs in the meiosis of gamete formation. The allels present in the chromosomal pairs separate and go into individual cells during the anaphase I of meiosis. The A and a alleles, for example,present on chromosome I. During meiosis I, the chromosomes align at the metaphase plate. The alleles from the chromosome pairs separate in reduction division and is distributed to daughter cells.
The mendelism does not work always, we tend to get incomplete dominance, co dominance...etc. One such classical example is coiling of snail. The snails have specific coiling pattern whether right handed or left handed. This coiling is controled by a dominant gene. This inheritance is not passed by nuclear genes, but by mitochondrial genes. Hence the they do not follow mendelian patterns.

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