Biology Tutorials > Genetics and Evolution > Mendel’s Law & Mendelian Genetics

Mendel’s Law & Mendelian Genetics

A chart depicting Mendel's Law of Dominance

A chart depicting Mendel’s Law of Dominance


Reviewed by: Mary Anne Clark, Ph.D.


The previous tutorial, Dominance, has described Gregor Mendel’s law of dominance. In this tutorial, you will learn another Mendel’s law — the principle of segregation.

Mendel’s Law of Segregation

The alleles of a gene exist in pairs but when gametes are formed, the members of each pair pass into different gametes. Thus each gamete contains only one allele of each gene.

Example of a Cross

The following dihybrid cross involves two true-breeding pea plants, where two factors are looked at, the shape of the seed and the color of the seed.

More examples of dihybrid cross here.

 

Mendel’s work, his laws of segregation and independent assortment, and try to understand what these mean for genetics and inheritance. Credit: Professor Dave Explains

 

Summary of Mendelian Genetics

The past few pages have elaborated on the work of Gregor Mendel and how his work has paved the way for predicting the characteristics of offspring. However, a degree of randomness is involved, when involving factors such as independent assortment during meiosis and the possibility of genetic mutations (explained in further pages).

In light of this, Mendel’s work allowed us to see that there is a degree of genetic inheritance from parents in offspring though modern biology indicates that more factors come into play to determine the final genotype and phenotype of an organism.

Sticking to the subject of genetics, the next tutorial looks at sex determination via chromosomes X and Y and some of the genetic traits inherited via these two chromosomes.

 

MENDEL’S PRINCIPLES OF HEREDITY – QUIZ (pdf)

MENDEL’S PRINCIPLES OF HEREDITY – QUIZ (pdf)

MENDEL’S PRINCIPLES OF HEREDITY – QUIZ

Print this quiz for your students to answer. The first part is a recall of Gregor Mendel’s principles of heredity. The second part is a multiple-choice test about alleles and sex chromosomes.

Subjects: Genetics & Evolution
Lesson: Mendelian Inheritance
Grades: 9th, 10th, 11th, 12th
Type: Quiz

 

Biology Tutorials > Genetics and Evolution > Mendel’s Law & Mendelian Genetics

You will also like...

Selective Breeding
Selective Breeding

Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..

Schematic diagram of DNA replication
DNA Structure & DNA Replication

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..

Buttress roots
Roots

This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

Freshwater aquatic plankton
Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

Darwin's Finches - Natural Selection
Darwin and Natural Selection

This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..