Principle of Inheritance and VariationMedium
Question
In a plant, black seed color ( $BB/Bb$ ) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?
Options
A.Bb
B.$BB/Bb$
C.BB
D.bb
Solution
Sol. [Key Concept: Test cross]
Cross the black seeded plant of unknown genotype, BB or Bb, with a homozygous recessive white seeded plant, bb. BB × bb gives all black offspring, whereas Bb × bb gives an expected 1 black:1 white ratio. Hence, option (4).
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