Non-Mendelian Inheritance

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Non-Mendelian Inheritance
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  • During breaktime:
  • Hey Alex! I'm absent yesterday. Can you teach me the lesson that you've talked about in the Genetics lecture?
  • Oh sure! We've talked about the Non-Mendelian Inheritance. I'll share with you what I've learned.
  • Codominance occurs when both alleles for a gene are expressed equally in the phenotype of heterozygotes. Incomplete dominance is a blending of the two alleles resulting in a third phenotype, which is a mixture of both alleles. Always remember that they don't have a genotypic ratio.
  • I'm quite confused about the difference between codominance and incomplete dominance.
  • The next mode is the multiple alleles in which a trait is controlled by more than two alleles. The best example of this is the ABO blood group system. While epistasis is the phenomenon when one gene affects the phenotype of another gene. Hair color and baldness are some examples of this. Lethal alleles could lead to the death of an organism.
  • Oh, I see. There's a lot of modes but, I think can distinguish them from each other.
  • How would I know if it is sex-limited or sex-influenced?
  • Amber, you will know if the traits are sex - limited if it is only apparent in one sex only. In contrast, sex-influenced if it is expressed in both males and females. However, don't forget that they are both autosomal traits.
  • Is that all?
  • Yup! Oh, by the way, I forgot about the sex-linked. These traits are influenced by genes on the X chromosome in humans. Hemophilia and color blindness are some examples of it.
  • Thank you, Alex! I've learned a lot from you. I owe you some lunch. See you tomorrow.
  • No problem! I got you. You can text or call me if you have any questions about it. See you!
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