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Mendelian Inheritance Patterns
1. PATTERNS
OF
INHERITANCE
By
Felix Boadu
Armstrong Obilor
2. PLAN OF PRESENTATION
2
Terminologies
Mendelian Traits
Mendel’s Laws of Heredity
Mendelian Traits In Humans
Patterns of Inheritance Tuesday, April 09, 2013
3. BASIC DEFINITIONS
3
HEREDITY - transmission of genetically controlled
characteristics
GENE - the basic unit capable of transmitting
characteristics from one generation to the next
GENOTYPE - the genetic makeup of an organism
PHENOTYPE - the visible characteristics of an
organism resulting from the interaction between its
genetic makeup and the environment Tuesday, April 09, 2013
Patterns of Inheritance
4. BASIC DEFINITIONS
4
INHERITANCE - is the way of passing of hereditary
information
HOMOZYGOTE - an organism that has two identical
genes at the same place on two corresponding
chromosome
HETEROZYGOTE - an organism possessing two
dissimilar forms of a gene for a heritable characteristic
ALLELE - one of two or more alternative forms of a
gene, occupying the same position locus on paired
chromosomes and controlling the same inherited 09, 2013
Patterns of Inheritance Tuesday, April
6. MENDELIAN TRAITS
6
TRAITS - a quality or
characteristic that is
genetically determined
Mendel’s Laws of
Heredity;
1st law – the law of unit
characters
2nd law – the law of
segregation
3rd law – the law of
independent assortment
Patterns of Inheritance Tuesday, April 09, 2013
7. THE LAW OF UNIT CHARACTERS
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It state that, the various hereditary characters are
controlled by factors, and there is a pair of factors for
each character
Also known as the law of monotony of
the first filial generation ( )
Patterns of Inheritance Tuesday, April 09, 2013
8. THE LAW OF SEGREGATION
8
It states that every individual possesses a pair
of alleles (assuming diploid) for any particular trait
and that each parent passes a randomly selected
copy (allele) of only one of these to its offspring
In F2 the ratio will be;
3:1 by phenotype and
1:2:1 by genotype
Patterns of Inheritance Tuesday, April 09, 2013
9. THE LAW OF INDEPENDENT ASSORTMENT
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It states that separate genes for separate traits are
passed independently of one another from parents to
offspring
Also known as the law of inheritance
Patterns of Inheritance Tuesday, April 09, 2013
10. THE LAW OF INDEPENDENT ASSORTMENT
10
Patterns of Inheritance Tuesday, April 09, 2013
11. MENDELIAN TRAITS IN HUMANS
11
Patterns of Inheritance Tuesday, April 09, 2013
12. MENDELIAN TRAITS IN HUMANS
12
Patterns of Inheritance Tuesday, April 09, 2013
