Advertisements
Advertisements
प्रश्न
A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible
उत्तर
Purple colour of flowers is a dominant phenotype in pea plants. The genotype of such plants can be determined by a test cross.
Test Cross
When an F1 hybrid is crossed with its homozygous recessive parent, it is known as test cross.
Test cross determines whether the dominant character is coming from homozygous dominant genotype or heterozygous genotype, e.g. purple flower coming from PP or Pw.
In this cross, plant with purple-coloured flowers is crossed with plant with white-coloured flowers, which will always have homozygous recessive genotype.
Thus, the genotype of pea plant bearing purple-coloured flowers in the school garden can be Pw or PP.
APPEARS IN
संबंधित प्रश्न
A single pea plant in your kitchen garden produces pods with viable seeds, but the individual papaya plant does not. Explain.
A cross was carried out between two pea plants showing the contrasting traits of height of the plants. The result of the cross showed 50% parental characters.
(i) Work out the cross with the help of a Punnett square.
(ii) Name the type of the cross carried out.
In a cross between two tall pea plants some of the offsprings produced were dwarf. Show with the help of Punett square how this is possible.
A garden pea plant (A) produced inflated yellow pod, and another plant (B) of the same species produced constricted green pods. Identify the dominant traits.
How are Mendelian inheritance, polygenic inheritance and pleiotropy different from each other?
How would you find genotype of a tall pea plant bearing white flowers? Explain with the help of a cross. Name the type of cross you would use.
Mention any two contrasting traits with respect to seeds in pea plant that were studied by Mendel.
A plant of F1 generation has genotype “AABbCC”. On selfing of this plant, the phenotypic ratio in F2 generation will be ______.
______ is a type of trait whose phenotype is influenced by more than one gene.
For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.
