12th Class Biology Sample Paper Biology - Sample Paper-8

  • question_answer
    (i) You are given tall pea plants with yellow seeds, whose genotypes are unknown. How would you find the genotype of these plants? Explain with the help of cross.
    (ii) Identify A, B and C in the table given below.
    Pattern in Inheritance Monohybrid \[{{F}_{1}}\] Phenotypic
    Codominance A'
    B' Progeny resembled only one of the parents
    Incomplete dominance C'
     

    Answer:

    (i)  The given tall pea plant with yellow seeds need to be crossed with a dwarf plant with green seeds.
    In this cross, the \[{{F}_{2}}\]-generation shows four phenotypes in the ratio of 1 : 1 : 1 : 1. So, the given plant is heterozygous for both the traits.      
    (ii) A - Dominant trait
    B-Dominance
    C - Phenotype obtained in between of two parental traits.
     


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