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.