CH 9 Gregor Mendel and the Foundations of Modern Genetics: Father of
Genetics, Pea Plant Experiments (1857–1863), Concept of Dominance, Law of
Segregation (Allele Separation During Meiosis), Law of Independent Assortment
(Random Arrangement of Homologous Chromosomes at Metaphase I), Genes,
Alleles, Dominant vs Recessive Traits, Genotype vs Phenotype, Homozygous vs
Heterozygous, Punnett Squares for Predicting Genotypic and Phenotypic Ratios,
Pedigree Charts (Symbols for Males/Females, Shaded Affected Individuals),
Autosomal Recessive Disorders (Cystic Fibrosis, Tay-Sachs, PKU), Autosomal
Dominant Disorders (Neurofibromatosis, Huntington’s Disease, Achondroplasia,
Hypercholesterolemia), Exceptions to Mendelian Inheritance, Polygenic
Inheritance (Multiple Allele Pairs, Continuous Traits) Exam Questions Verified
and Provided with Complete A+ Graded Rationales Latest Updated 2026
The background of Gregor Mendal and the methods he used to discover the laws of modern day
genetics
Considered the founder of the fundamental laws of Genetics.
Also referred to as the Father of Genetics.
In the garden of the Austrian abbey he was living in from 1857--1863, Mendel was the first to
analyze the patterns of inheritance
Working with pea plants, he first discovered that some genes / alleles are always expressed
(whether alone or in the presence of others) for each trait.
This is called the concept of dominance.
, He established the Law of Segregation -
States that as diploid organisms, humans have a pair of factors (alleles) for each trait. Those
alleles separate independently during meiosis. This results in each mature sperm or egg cell
(gametes) carrying one allele per trait.
Mendel's Law of
Independent Assortment
This law applies to genes located on different chromosomes.
The law states that each pair of alleles will separate independently of all other pairs due to the
random arrangement of homologous pairs at the equator of the spindle during Metaphase I.
Therefore, all possible combinations of alleles can occur in the gametes during meiosis.
Human Chromosome
Trait
a genetically determined characteristic or condition, such as Hair color: dark or light-colored
hair
Gene
Sequence of DNA that encodes a protein
Genetics, Pea Plant Experiments (1857–1863), Concept of Dominance, Law of
Segregation (Allele Separation During Meiosis), Law of Independent Assortment
(Random Arrangement of Homologous Chromosomes at Metaphase I), Genes,
Alleles, Dominant vs Recessive Traits, Genotype vs Phenotype, Homozygous vs
Heterozygous, Punnett Squares for Predicting Genotypic and Phenotypic Ratios,
Pedigree Charts (Symbols for Males/Females, Shaded Affected Individuals),
Autosomal Recessive Disorders (Cystic Fibrosis, Tay-Sachs, PKU), Autosomal
Dominant Disorders (Neurofibromatosis, Huntington’s Disease, Achondroplasia,
Hypercholesterolemia), Exceptions to Mendelian Inheritance, Polygenic
Inheritance (Multiple Allele Pairs, Continuous Traits) Exam Questions Verified
and Provided with Complete A+ Graded Rationales Latest Updated 2026
The background of Gregor Mendal and the methods he used to discover the laws of modern day
genetics
Considered the founder of the fundamental laws of Genetics.
Also referred to as the Father of Genetics.
In the garden of the Austrian abbey he was living in from 1857--1863, Mendel was the first to
analyze the patterns of inheritance
Working with pea plants, he first discovered that some genes / alleles are always expressed
(whether alone or in the presence of others) for each trait.
This is called the concept of dominance.
, He established the Law of Segregation -
States that as diploid organisms, humans have a pair of factors (alleles) for each trait. Those
alleles separate independently during meiosis. This results in each mature sperm or egg cell
(gametes) carrying one allele per trait.
Mendel's Law of
Independent Assortment
This law applies to genes located on different chromosomes.
The law states that each pair of alleles will separate independently of all other pairs due to the
random arrangement of homologous pairs at the equator of the spindle during Metaphase I.
Therefore, all possible combinations of alleles can occur in the gametes during meiosis.
Human Chromosome
Trait
a genetically determined characteristic or condition, such as Hair color: dark or light-colored
hair
Gene
Sequence of DNA that encodes a protein
