Non-Mendelian Inheritance
Biology ⇒ Genetics and Heredity
Non-Mendelian Inheritance starts at 10 and continues till grade 12.
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A cross between a red-flowered plant (RR) and a white-flowered plant (WW) produces all pink-flowered offspring (RW). What type of inheritance is this?
A cross between two pink snapdragons (RW) produces offspring in the ratio 1 red : 2 pink : 1 white. What type of inheritance does this demonstrate?
A plant with genotype RrYy is crossed with another plant of the same genotype. If the R and Y genes show epistasis, how might the phenotypic ratio differ from the classic 9:3:3:1 ratio?
Describe how epistasis can affect the expected phenotypic ratios in a dihybrid cross.
Describe the concept of multiple alleles using the ABO blood group system as an example.
Describe the difference between incomplete dominance and codominance.
Describe the inheritance pattern of mitochondrial DNA.
Explain how environmental factors can influence the expression of polygenic traits.
Explain how maternal inheritance differs from Mendelian inheritance.
Explain why mitochondrial diseases are inherited only from the mother.
Explain why the inheritance of skin color in humans is considered polygenic.
A woman who is heteroplasmic for a mitochondrial mutation (meaning she has both normal and mutant mitochondria) has children with a man who has only normal mitochondria. Explain how the proportion of affected offspring may vary and why this occurs.
Describe how genomic imprinting can lead to different phenotypes depending on the parent of origin, using Prader-Willi and Angelman syndromes as examples.
Explain the molecular basis of anticipation in trinucleotide repeat disorders, such as Huntington's disease or myotonic dystrophy.
In a certain plant species, the gene for flower color is influenced by two different genes: Gene A (with alleles A and a) and Gene B (with alleles B and b). The presence of at least one dominant allele of both genes (A_B_) results in purple flowers, while any other combination results in white flowers. If two plants with genotype AaBb are crossed, what is the expected phenotypic ratio of purple to white flowers in the offspring?
