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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.
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संबंधित प्रश्न
A single pea plant in your kitchen garden produces pods with viable seeds, but the individual papaya plant does not. Explain.
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.
Explain polygenic inheritance pattern with the help of a suitable example.
Mention any two contrasting traits with respect to seeds in pea plant that were studied by Mendel.
A polygenic inheritance in human beings is ______.
______ is a type of trait whose phenotype is influenced by more than one gene.
A polygenic trait is controlled by 3 gene A, B and C. In a cress AaBbCc × AaBbCc, the phenotypic ratio of the offspring's was observed as 1 : 6 : × 20 X : 6 : 1 - what is the possible value of X?
For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.
The pedigree chart given below represents the pattern of inheritance of sickle cell anemia in a family. Study it carefully and answer the questions that follow.
- What is the genotype of the father?
- What is the phenotype of the mother?
The pedigree chart given below represents the pattern of inheritance of thalassemia in a family.
What could be the genotype of the affected male?
