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Which of the following is a test cross?

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Important Questions on Principles of Inheritance and Variation

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Fruit shape in shepherd's purse (Capsella bursa ) is of two types- triangular and top-shaped. Triangular fruit shape (T) is dominant over top-shape (t). Following table summarises the results of several crosses.
Cross Result
Strain 1× tt All triangular
Strain 2× tt 1 triangular: 1 top-shaped
Strain 3× tt All top-shaped
Strain 4× Tt 3 triangular: 1 top-shaped

Which pair of strains possess the genotype Tt?
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Mendel formulated the law of purity of gametes on the basis of
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Read the given statements and select the correct option.
Statement I: The law of segregation is one of the most important contributions to the biology.
Statement II: It introduced the concept of heredity factors as discrete physical entities which do not become blended.
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The inheritance of flower colour in Antirrhinum (dog flower) is an example of ?
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What will be the phenotypic ratio in F2 generation for the inheritance of flower colour be in Antirrhinum (dog flower) ?
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In four O’clock plants, the gene for red flower colour (R) is incompletely dominant over the gene for white flower colour (r), hence the plants heterozygous for flower colour (Rr) have pink flowers. What will be the ratio of offsprings in a cross between red flowers and pink flowers?
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Andalusian fowls have two pure forms - black and white. If black forms BB and white forms WW are crossed, F1 individuals appear blue coloured BW , due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form?