Mendel And Mendelian Genetics

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Published on September 24, 2008

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Mendel and Mendelian Genetics Gregor Mendel 1822-1884 Published his findings in 1865

Gregor Mendel 1822-1884

Published his findings in 1865

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Mendel Considered the father of modern genetics Studied inheritance of pea plants Said that inheritance followed certain laws. His laws were not well accepted at first.

Considered the father of modern genetics

Studied inheritance of pea plants

Said that inheritance followed certain laws.

His laws were not well accepted at first.

Why Pea Plants? Mendel used pea plants in his experiments largely because of their ability to self pollinate.

Mendel used pea plants in his experiments largely because of their ability to self pollinate.

Mendel’s laws of inheritance Mendel came up with two major laws of inheritance: The law of segregation (4 parts) The law of independent assortment.

Mendel came up with two major laws of inheritance:

The law of segregation (4 parts)

The law of independent assortment.

Law of Segregation There are four parts to this law There are alternate versions of genes called alleles. For each characteristic, an organism inherits two alleles. Alleles interact in a number of ways. (dominance, incomplete dominance, codominance) The two alleles for a trait separate during gamete production

There are four parts to this law

There are alternate versions of genes called alleles.

For each characteristic, an organism inherits two alleles.

Alleles interact in a number of ways. (dominance, incomplete dominance, codominance)

The two alleles for a trait separate during gamete production

 

Law of independent assortment This law states the inheritance of one trait will not affect the inheritance of another. This is only true for traits that are not linked.

This law states the inheritance of one trait will not affect the inheritance of another.

This is only true for traits that are not linked.

The importance of Mendel Why is Mendel’s work so important? Before his time no one took the time to figure out how traits were passed on. Mendel’s work laid the basic framework for other scientists to build on.

Why is Mendel’s work so important?

Before his time no one took the time to figure out how traits were passed on.

Mendel’s work laid the basic framework for other scientists to build on.

After Mendel Mendel’s work was rediscovered in 1900. Other scientists started to add to his ideas to build the current model of genetics as we know it. This is called classical genetics.

Mendel’s work was rediscovered in 1900.

Other scientists started to add to his ideas to build the current model of genetics as we know it.

This is called classical genetics.

Crosses Heterozygote: contains both types of alleles for a trait. (Aa) Homozygous: contains only one allele for a trait (AA or aa) Generations are labeled as F #

Heterozygote: contains both types of alleles for a trait. (Aa)

Homozygous: contains only one allele for a trait (AA or aa)

Generations are labeled as F #

Monohybrid vs Dihybrid Monohybrid = Aa X Aa Dihybrid = AaBb X AaBb Law of independent assortment says that the inheritance of A will not effect B.

Monohybrid = Aa X Aa

Dihybrid = AaBb X AaBb

Law of independent assortment says that the inheritance of A will not effect B.

 

http://www.biology.arizona.edu/mendelian_genetics/mendelian_genetics.html

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