Lab stations activity: investigating complex inheritance patterns

Mendel's laws only apply to some restricted hereditary situations, that is, to those traits that are determined by a single pair of allele genes and that are found on different homologous chromosomes. Among the hereditary mechanisms that do not conform to the laws described by Mendel, the complex inheritance patterns can be mentioned: intermediate inheritance, codominance, multiple alleles and inheritance linked to sex.

Explanation:

Inheritance has patterns of transmission from parents to children such as those governed by Mendel's laws known as Mendelian inheritance, however, there are other inherited patterns known as complex inheritance patterns, among which are intermediate inheritance, codominance, multiple alleles and inheritance linked to sex. An inherited trait with an intermediate inheritance pattern expresses the two alleles that the individual possesses, but neither of them is observed as it originally is, but rather an intermediate phenotype is seen. Codominance is a situation that occurs when two different alleles are found in the genotype and both are expressed. Multiple alleles or polyalelia occur when genes have more than two allelic forms. In the case of multiple alleles, three or more alleles are present to determine a population trait. Sex-linked inheritance refers to the transmission and expression, in different sexes, of genes that are found in the non-homologous (heterologous) sector of the X chromosome inherited from the father. Two known examples are: hemophilia and color blindness determined by recessive genes in both cases.

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