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Question
Long answer type question.
Define test cross and explain its significance.
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Solution
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.
- In rapid crop improvement programmes, test cross is used to introduce a useful recessive trait in the hybrids.
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RELATED QUESTIONS
What is a test cross?
Design a test-cross.
Read the following case and select the correct option.
ln a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring.
Therefore, it can be concluded that;
A cross between Fl hybrid and its parent is called______.
Statement I - Back cross is the crossing of F1 - hybrid with one of the two parents from which they were derived.
Statement II - Test cross involves the crossing of F1 - hybrid with its homozygous recessive parent.
In light of above statements, choose the correct answer from the option given below.
When a test cross produces all offspring with the dominant phenotype, what can be concluded about the dominant parent's genotype?
What phenotypic ratio in test cross offspring indicates that the dominant parent is heterozygous (Tt)?
In a back cross between F₁ (Tt) and the homozygous recessive parent (tt), what phenotypic ratio is observed?
What is the primary practical application of test crosses in agriculture?
Based on test cross principles, if a tall plant consistently produces dwarf offspring when crossed with homozygous dwarf plants, what is the tall plant's genotype?
