According to Mendel’s law, phenotypical characteristics are determined by pairs of factors (alleles) that separate independently...

According to Mendel’s law, phenotypical characteristics are determined by pairs of factors (alleles) that separate independently in gametes. What are the main types of inheritance that are exceptions to Mendel’s rules?

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Expert Solution

The exceptions to mendilian inheritance :
Polygenic traits: Some characters determined by morethan one pair of genes. Eg. Human height, skin color etc.

Intermediate Expression or incomplete dominance: In heterozygous condition due to blending intermediate phenotype expression occurs due to lack of complete dominance.
Eg. Flower color in 4'O clock plant. Pink is the example for incomplete dominance, where as Red and white are due to homozygous alleles.

Codominance: In heterozygous condition, both alleles expresses her characters.
Eg. Blood groups such as ABO and MN systems.

Incomplete penetrance: Some of the genes does not show their effect untill cetrain factor are present.
Eg. Multiple sclerosis in humans.

Sex-limited genes : These genes inherited by both sexes but these will be expressed in only one sex.
Eg. Facial hair.

sex-controlled genes : These genes inherited by both sexes but expression in both sexes differently. Eg. Gout disease. This gene expressed more in man than woman.

Pleiotropy: A single gene controls expression of morethan one trait.
Eg. Albinism.

gladiator answered 1 year ago

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