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Answer: The non-Mendelian traits do not depend on the concept of dominant or recessive genes. In Pleiotropy, one gene affects multiple characteristics of the individual. Moreover, in Polygenic Inheritance, there are numerous genes contributing to one trait; height in humans, e.g., is a result of the interplay of approximately 400 genes. Lethality Due to Alleles: At times, the combination of the multiple alleles can make the survival of the individual difficult to impossible; e.g., a hybrid between two heterozygous yellow mice makes them give birth to yellow and brown mice in a ratio of 2:1. True or false? Question 1: What is the Difference Between Mendelian and Non-Mendelian Inheritances? In this type of Non-Mendelian Inheritance, we see particular traits in an individual that are related to gender. Answer: There are two major types of inheritances, namely, Mendelian and non-Mendelian inheritances. All rights reserved. contributing to certain types of genetic disorders. In the spermatozoa, e.g., there is no cytoplasm; therefore, the phenotype of traits related to extranuclear DNA is derived from the mother. Similarly, the pigmentation of the skin is controlled by at least four genes. Mice that have homozygous alleles die during the gestation period, especially during the embryonic development. Multiple Alleles is a phenomenon in co-dominance Inheritance which is present in some populations; in which, there are various traits seen in different individuals resulting from one gene but from different alleles. Earn Transferable Credit & Get your Degree. Mice that have homozygous alleles die during the gestation period, especially during the embryonic development. In fruit flies, the reddish-brown pigment in the eyes is a result of at least three genes. Scientists stumbled across the phenomenon when they began exploring more and more case studies; they soon realised that there are various types of non-Mendelian Inheritances. There are four common alleles of this gene, viz., CC giving black or brown fur; CchCch giving grey fur also known as chinchilla colouration; ChCh giving white body fur and dark ears, face, feet and tail; and cc giving a pure white fur and reddish eyes as a result of albinism. Most genetic disorders are caused... Identify a human disorder that is caused by a... Is it possible to get genetic tests of other... For the Systemic primary deficiency (SPCD), what... UExcel Earth Science: Study Guide & Test Prep, OSAT Physics (CEOE) (014): Practice & Study Guide, Middle School Life Science: Help and Review, DSST Environmental Science: Study Guide & Test Prep, Middle School Life Science: Homework Help Resource, Biological and Biomedical Heritable Traits: Heritable traits are those that you can inherit from one of your parents through the genes passed down to you. Question 2: Do the Non-Mendelian Traits Depend on Dominant or Recessive Genes? The non-Mendelian Inheritance is a form of genetic Inheritance which is not in accordance with Mendel’s law. Sciences, Culinary Arts and Personal Albinism is another example of one gene affecting the skin, eyes and hair colours. In the non-Mendelian type of Inheritance, there are different genes acting to show one trait, or various traits resulting from one gene. The interplay of various genes or one gene affecting the physiology of the individual can give rise to diseases that are sometimes fatal. These kinds of lethal alleles can be found in dominant or recessive forms, and they can express the individual’s traits in homozygous or heterozygous cases. Examples of non-inherited traits include table manners, greeting customs (for example, handshake or bow), a preference for certain types of foods, and parenting skills. Some times, the traits are also seen in the phenotypes resulting from both the alleles that are different. These kinds of lethal alleles can be found in dominant or recessive forms, and they can express the individual’s traits in homozygous or heterozygous cases. Create your account. At times, the combination of the multiple alleles can make the survival of the individual difficult to impossible; e.g., a hybrid between two heterozygous yellow mice makes them give birth to yellow and brown mice in a ratio of 2:1. Extranuclear Inheritance is also known as cytoplasmic Inheritance and some times is also known as Mitochondrial Inheritance. In cloning, e.g., there is a risk of transfer of genes from the mitochondria of the donor cell. In non-Mendelian genetics, the traits of an individual are linked to a single gene or chromosome from the nuclear DNA. Traits are physical characteristics that can be displayed by animals (including human beings) and some plants. There are even some genetic disorders that pass from the mother to the offspring that have their origin in the mitochondrial DNA. 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