Punnett Squares and Pedigrees

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

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What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

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What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is DNA?

Back

DNA (deoxyribonucleic acid) is a complex molecule that carries genetic information defining an organism's traits.

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele is expressed in the phenotype even if only one copy is present, while a recessive allele is only expressed if two copies are present.

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What does it mean if an organism is homozygous recessive?

Back

An organism is homozygous recessive if it has two identical recessive alleles for a trait, such as aa.

Front

What is a pedigree chart?

Back

A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism across generations.

Front

What is the expected phenotypic ratio from a monohybrid cross?

Back

The expected phenotypic ratio from a monohybrid cross is typically 3:1 for dominant to recessive traits.