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प्रश्न
Long answer type question.
Define test cross and explain its significance.
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उत्तर
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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संबंधित प्रश्न
Design a test-cross.
Explain the significance of a test cross.
Explain the statement of
Test cross is back cross but back cross is not necessarily a test cross.
Define the following term:
Dihybrid cross
An individual produced during a cross between two pure plants differing in two pairs of contrasting characters is always ______
In order to achieve a dihybrid test cross, the F1 hybrid YyRr should be crossed will which one of the following genotypes?
Match List I with List II -
| List-I | List-II |
| A. Two or more alternative forms of a gene | I. Back cross |
| B. Cross of F1 progeny with homozygous recessive parent | II. Ploidy |
| C. Cross of F1 progeny with any of the parents | III. Allele |
| D. Number of chromosome sets in plant | IV. Test cross |
Choose the correct answer from the options given below:
In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?
A purple flowered pea plant is crossed with a white flowered pea plant. Among the progeny, there are equal number of purple and white flowered plants. The result indicates that it is ______.
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.
