GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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of two pure breeding to find out which form of a gene is dominant
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between two unknown forms to determine their genotypes
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between an offspring and its parent
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of an F1 hybrid to an homozygous recessive
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Detailed explanation-1: -Test-cross is an experimental method to determine the genotype of organisms. In this cross, the unkown genotype is crossed with known homozygous recessive genotype. It is used to distinguish the pure homozygous (recessive) and hybrid (heterozygous dominant). Thus, the correct answer is option C.
Detailed explanation-2: -When the cross is between an F1 hybrid with the homozygous recessive parent, it is known as a Test Cross.
Detailed explanation-3: -In a test cross, the F1 generation is exclusively crossed with the recessive parent only. The test cross helps in determining the genotype of the F1 generation. In the outcross, the crossing is done between the F1 generation and the dominant parent. It is done to increase genetic diversity.
Detailed explanation-4: -the F1 hybrid with a double recessive genotype. The correct option is D. Explanation of the correct option: Crossing a plant having a dominant characteristic with a homozygous recessive genotype is known as a test cross. The test cross can be used to identify the genotype of F1 hybrids displaying dominant traits.
Detailed explanation-5: -When a progeny of F1 is crossed with the homozygous recessive parent it is called test cross. Such a cross is useful to determine the genotype of an unknown i.e. whether it is heterozygous or homozygous dominant for the trait.