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Question
Explain the statement of
Test cross is back cross but back cross is not necessarily a test cross.
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Solution
- In the back cross, F1 generation can be crossed with either dominant or recessive parent.
- But in test cross, F1 generation is crossed with a recessive parent only.
- Thus, in the back cross, if F1 generation is crossed with a recessive parent it will be a test cross, but if F1 generation is crossed with a dominant parent it will not be a test cross. Therefore, the test cross is a back cross but the back cross is not necessarily a test cross.
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Dihybrid cross
Long answer type question.
Define test cross and explain its significance.
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;
An individual produced during a cross between two pure plants differing in two pairs of contrasting characters is always ______
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.
