To study the prepared pedigree charts of genetic traits such as rolling of tongue, widow's peak, blood groups and colour blindness

 Practical Notebook Biology Standard XII

Biology 

Answeres

Practical Notebook
Standard XII

Class-12th

science

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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 Carrier of sex-linked recessive Death Abortion or stillbirth ( sex unspecified ) Propositus Method of identifying persons in a pedigree, here the propositus in child 2 in generation 11 or 11-2 Consanguineous marriage ( mating between relation ) such Procedure: Observe the given pedigree chart and write comments on it. 

 1. Inability to roll the tongue: 

S widow's peak, blood groups, and color blindness.  Aim: To Study the prepared pedigree charts of genetic traits such as rolling of toot Requirements: Prepared pedigree charts of genetic traits.  KAGE ' 1 The rolling of the tongue is the ability of a person to roll the tongue inwards in U " shaped as show ' a '. Both homozygous dominants ( AA ) and heterozygous ( Aa ) individuals are able to roll in the following figure.  The inability to roll the tongue is caused by autosomal recessive allele longue while homozygous recessive ( aa ) individuals are unable to roll the tongue.