Principles of Inheritance & Variation

Mendelian genetics, deviations, sex determination, linkage, mutations, genetic disorders.

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Q1 · Principles of Inheritance & Variation · EASY
In a dihybrid cross between two heterozygous individuals (AaBb × AaBb), what is the phenotypic ratio obtained in the F2 generation, assuming complete dominance and independent assortment?
Q2 · Principles of Inheritance & Variation · MEDIUM
A woman with normal vision whose father was colour blind marries a man with normal vision. What percentage of their sons are expected to be colour blind? (Colour blindness is an X-linked recessive trait)
Q3 · Principles of Inheritance & Variation · MEDIUM
In a test cross of a dihybrid individual (AaBb), the following offspring were obtained: 47% AaBb, 47% aabb, 3% Aabb, 3% aaBb. This deviation from the expected 1:1:1:1 ratio is best explained by which phenomenon?
Q4 · Principles of Inheritance & Variation · HARD
A couple has three daughters. The woman is pregnant with their fourth child. Assuming equal probability of male and female births and independent events, what is the probability that the fourth child will be a son?
Q5 · Principles of Inheritance & Variation · HARD
A dihybrid cross between two heterozygous individuals (AaBb × AaBb) results in a phenotypic ratio of: