Non-Mendelian Inheritance
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This document discusses several forms of non-Mendelian inheritance including incomplete dominance where traits show a combined phenotype, co-dominance where offspring exhibit both parental traits together, multiple alleles where more than two alleles can code for a trait, maternal and paternal effects where the parent's environment or genotype influences the offspring's phenotype, epigenetic inheritance involving modification to genes or chromosomes early in development, and gene conversion being a DNA recombination process that transfers sequence information between DNA helices.
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Non-Mendelian Inheritance
- 2. Non-Mendelian Inheritance It is a term used to refer to any pattern of inheritance in which traits do not segregate in accordance with Mendel’s Laws
- 3. Incomplete Dominance A form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype
- 5. Co-Dominance A cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together.
- 6. Multiple Alleles Involves more than just the typical two alleles that usually code for a certain characteristic in a species
- 7. Maternal Effect A situation where the phenotype of an organism is determined not only by the environment it experiences and its genotype, but also by the environment and genotype of its mother Occurs when an organism shows the phenotype expected from the genotype of the mother
- 8. Paternal Effect A phenotype results from the genotype of the father The genes responsible for these effects are components of sperm that are involved in fertilization and early development.
- 9. Epigenetic Inheritance Modification occurs to a nuclear gene or chromosome. This occurs during spermatogenesis, oogenesis, and early stages of embryogenesis
- 11. Gene Conversion One of the major forms of Non- Mendelian Inheritance It is a reparation process in DNA recombination, by which a piece of DNA sequence information is transferred from one DNA helix (which remains unchanged) to another DNA helix, whose sequence is altered.