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Extensions of Mendelian Genetics

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Extensions of Mendelian Genetics

Prof. Dr. İsmail AKYOL Prof. Dr. M. Ali YILDIZ Prof. Dr. M. Muhip ÖZKAN

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Outline of course

• While alleles are transmitted from parent to offspring

according to Mendelian principles, they often do not display the clear-cut dominant /recessive relationship observed by Mendel.

• In many cases, in a departure from Mendelian genetics, two or more genes are known to influence the phenotype of a single characteristic.

• Still another exception to Mendelian inheritance occurs

when genes are located on the X chromosome, because one of the sexes receives only one copy of that chromosome,

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Outline of course

• The result of the various exceptions to Mendelian principles is the occurrence of phenotypic ratios that differ from those

produced by standard monohybrid, dihybrid, and trihybrid crosses.

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