Principles of Inheritance & Variation PPT Biology Class 12

 Page 1


PRINCIPLES OF INHERITANCE AND
VARIATION
Page 2


PRINCIPLES OF INHERITANCE AND
VARIATION
PRINCIPLES OF INHERITANCE AND
VARIATION
? Genetics: deals with the inheritance, as well as the variation  
of characters from parents to offsprings.
? Inheritance: is the process by which characters are passed  
on from parent to progeny .
? V ariation: is the degree by which progeny differ from their
parents.
Page 3


PRINCIPLES OF INHERITANCE AND
VARIATION
PRINCIPLES OF INHERITANCE AND
VARIATION
? Genetics: deals with the inheritance, as well as the variation  
of characters from parents to offsprings.
? Inheritance: is the process by which characters are passed  
on from parent to progeny .
? V ariation: is the degree by which progeny differ from their
parents.
MENDEL ’S LAWS OF INHERITANCE:
? Gregor Mendel. Conducted hybridization experiments on  
garden peas for seven years (1856 – 1863) and proposed laws  
of inheritance.
? Mendel conducted artificial pollination/cross pollination  
experiments using several true-breeding pea lines.
? A true breeding line is one that, having undergone
continuous self-pollination for several generations.
? Mendel selected 14 true-breeding peas’ plant varieties,as  
pair’ s which were similar except for one character with  
contrasting traits.
Page 4


PRINCIPLES OF INHERITANCE AND
VARIATION
PRINCIPLES OF INHERITANCE AND
VARIATION
? Genetics: deals with the inheritance, as well as the variation  
of characters from parents to offsprings.
? Inheritance: is the process by which characters are passed  
on from parent to progeny .
? V ariation: is the degree by which progeny differ from their
parents.
MENDEL ’S LAWS OF INHERITANCE:
? Gregor Mendel. Conducted hybridization experiments on  
garden peas for seven years (1856 – 1863) and proposed laws  
of inheritance.
? Mendel conducted artificial pollination/cross pollination  
experiments using several true-breeding pea lines.
? A true breeding line is one that, having undergone
continuous self-pollination for several generations.
? Mendel selected 14 true-breeding peas’ plant varieties,as  
pair’ s which were similar except for one character with  
contrasting traits.
Page 5


PRINCIPLES OF INHERITANCE AND
VARIATION
PRINCIPLES OF INHERITANCE AND
VARIATION
? Genetics: deals with the inheritance, as well as the variation  
of characters from parents to offsprings.
? Inheritance: is the process by which characters are passed  
on from parent to progeny .
? V ariation: is the degree by which progeny differ from their
parents.
MENDEL ’S LAWS OF INHERITANCE:
? Gregor Mendel. Conducted hybridization experiments on  
garden peas for seven years (1856 – 1863) and proposed laws  
of inheritance.
? Mendel conducted artificial pollination/cross pollination  
experiments using several true-breeding pea lines.
? A true breeding line is one that, having undergone
continuous self-pollination for several generations.
? Mendel selected 14 true-breeding peas’ plant varieties,as  
pair’ s which were similar except for one character with  
contrasting traits.
INHERITANCE OF ONE GENE: