Objectives:. General: Understand the concepts underlying Mendelian Genetics. Specific: 1. Identify the factors that influence individuality. 2. Describe the experiment of Mendel and explain their importance to the science of heredity. 3. Solve monohybrid crosses. .
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Understand the concepts underlying Mendelian Genetics.
1. Identify the factors that influence individuality.
2. Describe the experiment of Mendel and explain
their importance to the science of heredity.
3. Solve monohybrid crosses.
Responsible for the Laws governing Inheritance of Traits
2 B 2
is any observable characteristic or trait of an organism: such as its morphology and development.
isthe genetic makeup of a cell, an organism, or an individual. Represented by letters (WW, YY, Yy, Dd)
a diagram that is used to predict an outcome of a particular cross or breeding experiment.
Reginald C. Punnett
F1 Phenotype: Purple
Trait: Flower Color
W – Purplew – White
Cross: Purple Flower x White Flower
WW x ww
F2 Phenotype: _____
Genotype Ratio: ___
Phenotype Ratio: ___
Trait: Flower Color
Ww– PurpleWw– Purple
Cross: Purple Flower x Purple Flower
Ww x Ww
a. the F1 generation?
b. the F2 generation?
Law of Dominance- States that when pure-breeding plants having contrasting characters are crossed, all the offspring will show only one of the characters. That which appears is the dominant character; that which does not appear is the recessive character.
Principle of Segregation- For any particular trait, the pair of alleles of each parent separate and only one allele passes from each parent on to an offspring.
It describes how genes are transmitted from parent to offspring.
Principle of Independent Assortment- Different pairs of alleles are passed to offspring independently of each other. The result is that new combinations of genes present in neither parent are possible. For example, a pea plant's inheritance of the ability to produce purple flowers instead of white ones does not make it more likely that it will also inherit the ability to produce yellow pea seeds in contrast to green ones.