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प्रश्न
How would you find out whether a given tall garden pea plant is homozygous or heterzygous? Substantiate your answer with the help fo Punnett squares.
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उत्तर
Test cross helps to find out whether the given tall garden pea plant is homozygous or heterzygous.
When a progeny of F1, is crossed with the homozygous recessive parent, it is called test Cross.
Test cross between pure dominant (A) and hybrid dominant (B) individuals with recessive parent is shown below :
Such a cross is useful to determine the genotype of an unknown trait, i.e., whether it is heterozygous or homozygous dominant for the trait.
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संबंधित प्रश्न
Differentiate between the following:
Dominance and Recessive
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
What do the plants of the F1 generation look like?
Punnett square is used to know
Cross between hybrid and recessive parent:
In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?
Assertion (A): In humans, if gene (B) is responsible for black eyes and gene (b) responsible for brown eyes, then the colour of eyes of the progeny having gene combination Bb, bb or BB will be black only.
Reason (R): The black colour of the eyes is a dominant trait.
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
Mendel used a monohybrid cross to understand how which feature passes from parents to offspring?
What is the genotype of the pure tall plant selected in the experimental sequence?
What are the four genotypic outcomes of the cross \[Tt \times Tt\]?
