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Mendelian inheritance does not apply to the inheritance of alleles that result in incomplete dominance and codominance.

Why? How are the alleles in these two situations different from the alleles that Mendel studied?

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DrMantisToboggan

Answer:

Explanation:

Phenotypes that Mendel studied was controlled by one gene that had two possible alleles, dominant and recessive allele. This made it possible to see just one or the other phenotype (total of 2 phenotypes).

Well now we know that a characteristic may be controlled by one gene with two alleles, but the two alleles may not have a traditional relationship of dominant and recessive. Which is why we see the patterns like codominance and incomplete dominance.

Codominance is when both alleles are expressed equally in the phenotype of the heterozygote. For example, you have a black flower and red flower, a codominant flower would have both black petals and red petals. Do you see how the traditional relationship of one being dominant and other being recessive no longer holds because you express both alleles.

Incomplete dominance occurs when the phenotype of the offspring is somewhere in between the phenotype of both parents. SO a black and red flower would make an offspring with purple petals where neither of the alleles reigns supreme over other rather we get a mixture of both alleles.

The passing of the alleles from the parent to the offspring in a particular manner was given by Mendel, he defined the passing of the recessive and the dominant allele in a specific way from generations.

Mendelian inheritance does not apply to incomplete and co-dominance.

The exception of the Mendelian inheritance can be explained as:

  • The condition in which the allele is not completely expressed in the progeny is called incomplete dominance while the expression of both the recessive and the dominant allele in the progeny together is called co-dominance.

  • In the co-dominance case of hetero-zygotic phenotype, the allele is depicted equally. The law of recessive and dominance does not apply here and both the alleles are expressed in the progeny in equal ratio.

  • In the incomplete dominance condition, the phenotypic character of the progeny is in the middle and a mixture of both the dominant and the recessive allele.

Therefore, the Mendelian inheritance law does not apply to incomplete dominance and co-dominance.

Learn more about incomplete dominance and co-dominance here:

https://brainly.com/question/1429818

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