Principles of Inheritance and Variation
Mendelian genetics, sex-linked inheritance, mutations, pedigree analysis, genetic disorders.
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Take a full mock →Q1 · Principles of Inheritance and Variation · EASY
In a dihybrid cross between two heterozygous parents (AaBb × AaBb), what is the phenotypic ratio of offspring in the F2 generation, assuming independent assortment and complete dominance?
Q2 · Principles of Inheritance and Variation · MEDIUM
A woman with normal vision (carrier for colour blindness) marries a man with normal vision. What is the probability that their son will be colour blind? (Colour blindness is X-linked recessive)
Q3 · Principles of Inheritance and Variation · MEDIUM
In a certain plant, tall (T) is dominant over dwarf (t), and red flowers (R) are dominant over white flowers (r). A tall plant with red flowers (genotype TtRr) is crossed with a dwarf plant with white flowers (ttrr). What proportion of offspring will be tall with white flowers?
Q4 · Principles of Inheritance and Variation · MEDIUM
A pedigree shows that a particular genetic disorder appears in every generation and affects males and females equally. Affected individuals always have at least one affected parent. What is the most likely mode of inheritance?
Q5 · Principles of Inheritance and Variation · HARD
In humans, the ABO blood group system involves three alleles: IA, IB, and i. IA and IB are codominant, and both are dominant over i. A man with blood group AB (IAIB) marries a woman with blood group O (ii). They have a child with blood group B. What is the explanation for this result?