Mendelian Basis Of Inheritance

Mendelian Basis of Inheritance

Gregor Mendel- Father of Genetics

Studies of Gregor Mendel

Mendel’s 4 Postulates  Unit factors in pairs  Dominance /Recessiveness  Segregation  Independent Assortment

Monohybrid Cross

Monohybrid Cross  Genotype-genetic

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makeup of an individual  Phenotype-physical traits of an individual as expressed from the genotype

Testcross

Problem Solving:

 1. In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of ¾ black and ¼ white guinea pigs. Diagram this cross, showing the genotypes and phenotypes.  2. Albinism in humans is inherited as a simple recessive trait. For the ff families, determine the genotypes of parents and offspring. When two alternative genotypes are possible, list both. A. Two normal parents have five children, four normal and one albino. B. A normal male and an albino female have six children, all normal. C. Which of the Mendel’s postulates are illustrated?

Dihybrid Cross

Problem Solving:  Mendel crossed peas having round seeds and yellow

cotyledons with peas having wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram this cross through the F2 generation using both the Punnett square or branch method.  With regard to the ABO blood types in humans, determine the genotypes of the male parent and female parent: Male Parent: Blood type B whose mother was type O Female Parent: Blood type A whose father was type B. Predict the blood types of the offspring that this couple may have and the expected proportion of each.

Principle of Segregation

Incomplete Dominance

Multiple Allelism  Dominance/Recessiveness  Codominance

Epistasis

Trihybrid Cross

Human Inheritance