AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A testcross consists of a cross
A
of two pure-breeding forms to find out which form of a gene is dominant
B
between two unknown forms to determine their genotypes
C
between an offspring and its parent
D
of an F1 hybrid to an individual that is homozygous recessive
E
of two F2 individuals to produce an F3 generation
Explanation: 

Detailed explanation-1: -A cross between F1 hybrid and its homozygous recessive parent is called Test cross.

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: -∙ The cross between recessive to its hybrid or its F1 plant is called a test cross. ∙ Test cross helps in determining the genotype of the hybrid plant by crossing F1 with the recessive parent.

Detailed explanation-4: -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.

Detailed explanation-5: -c) A test cross is a cross between an individual of unknown genotype or a heterozygote (or a multiple heterozygote) to a homozygous recessive individual.

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