Principle of Inheritance and VariationMediumBloom L3
Question
Test cross involves
Options
A.crossing between two F1 hybrids
B.crossing the F1 hybrid with a double recessive genotype
C.crossing between two genotypes with dominant trait
D.crossing between two genotypes with recessive trait
Solution
Sol.(b) [Key Concept: Test Cross — Definition] A test cross involves crossing the F1 HYBRID (showing dominant phenotype, unknown genotype: AA or Aa) with a DOUBLE RECESSIVE genotype (homozygous recessive: aa or aabb for dihybrid). The recessive parent produces only one type of gamete (a), so the offspring phenotypes directly reveal the genotype of the F1: if all dominant → F1 is AA; if 1:1 (dominant:recessive) → F1 is Aa. This is used to determine unknown genotypes.
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