Advertisements
Advertisements
प्रश्न
Long answer type question.
Define test cross and explain its significance.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Design a test-cross.
Define the following term:
Dihybrid cross
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.
What phenotypic ratio in test cross offspring indicates that the dominant parent is heterozygous (Tt)?
What is the expected genotypic ratio when an F₁ heterozygous individual (Tt) is back crossed with the homozygous dominant parent (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?
