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  Practical Notebook Biology Standard XII Biology  Answeres Practical Notebook Standard XII Class-12th science Click here download in PDF To study the prepared pedigree charts of genetic trolling of the tongue, widow's peak, blood groups, and color blindness  Male Female Introduction:  A pedigree is a list of ancestors showing genetic relationships between members of a family.  A record of inheritance of certain genetic traits for two or more generations is presented in the form of a family tree or a diagram is called a pedigree chart.  The study of pedigree charts provides a strong tool, which is used to trace the inheritance of a specific trait, abnormality, or disease family.   In a pedigree charts specific that are used, are indicated below:  Mating symbols and children 1 bey I girl ( in order of beth ) Duygotic ( identical twin ) Monorygotic ( identical twins ) Sex unspecified OOD Number of children of sex indicated Affected individuals  Heterorypotes for autosomal recessive

  Practical Notebook Biology Standard XII Biology  Answeres Practical Notebook Standard XII Class-12th science Click here download in PDF 10. Dissect and display floral whorls.  Dissect another and take T.S.  or V.S.  of the ovary to show pollen grains and locules of the ovary, respectively.    Aim:  To dissect given flowers to study and display different whorls.  Dissect anther and ovary to show a number of locules (chambers).   Requirements: -  Flowers such as Brassica or Hibiscus.  Forceps, razor blade, slides, two needles, coverslips, dissecting microscope, paper, etc.  Ced  Procedure: -  Observe different floral whorls such as calyx, corolla, androecium, and gynoecium.  Take out each floral whorl carefully and arrange them in proper ascending order on white paper.  Count the members of each whorl and also note down, if there is cohesion or adhesion between the members of the same whorl or different whorls.  Mount the anthers on the slide and observe them under a lens or dissectin