Question

difine test cross of explain its significance​

Answer 1

Answer:

Definition: The cross between F1 hybrid and its homozygous recessive parent is called a test cross. Significance of test cross: It helps to determine whether individuals exhibiting dominant character are genotypically homozygous or heterozygous. It has wide application in plant breeding experiments.

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The test cross is performed to determine the genotype of a dominant parent if it is a heterozygous or homozygous dominant. On the basis of the results obtained in the ratio of the offspring, it can be predicted that the parent is having which genotype.

Answer 2

• An F11 progeny is crossed with a double (homozygous) recessive parental progeny to see if the progeny is homozygous or heterozygous for a certain trait.
• This is referred to as a "test cross."
• The test cross is used to establish if a dominant parent is heterozygous or homozygous.
• It is possible to determine which genotype the parent has based on the findings of the offspring ratio.
• When all of the children have the same phenotype, the parent is homozygous dominant.
• The parent is heterozygous dominant if the phenotype of the organisms is 1:1.