This set of worksheets focuses on understanding heredity and the transfer of traits to offspring.

Have you ever thought why your hair is a certain color or your eyes? Each gene in our DNA determines or in some way affects something in our body. This is true for humans and all other living things. DNA is composed of tons of different genes. Each gene controls a trait that is expressed in the body of the organism. Human are thought to have twenty-five thousand genes. Genes undergo changes over the life of the organism they are in. In many cases genes can be altered naturally and in some cases can be altered by their environment. Genetics is the science of understanding how characteristics are transferred from a parent to their young.

This series of worksheets keys in on the prediction of hereditary trait transfer. They start with simple Punnett Squares and move to detecting complex Dihybrid traits.

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Print Genetics Worksheets

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Using Punnett Squares

Using the Punnett square below, predict the frequencies of the genotypes and phenotypes of the offspring.

Genetics of Blood Types

Using the Punnett squares below, determine the expected frequencies of the blood types of offspring in the following cases.

Crosses Between Two Traits

We look at a cross involving two phenotypes I called a dihybrid cross.

Human Pedigree Charts

By studying a human pedigree, you can determine whether a trait is dominant or recessive.

Structure of DNA

DNA molecules consist of a sequence of nucleotides, each of which consists of a phosphate, a deoxyribose sugar and a nitrogenous base.

Transcription and mRNA

Each set of the three nitrogenous bases in the exons of the mRNA molecule is a codon. Each of these codes for a specific amino acid.

Genetics Crossword Puzzle

See how many genetics terms you have mastered.