Unit 3 Genetics Review*

Front

What is a Dominant trait?

Back

A trait that is expressed when at least one dominant allele is present in the genotype.

Front

What is a Recessive trait?

Back

A trait that is only expressed when two recessive alleles are present in the genotype.

Front

Define phenotype.

Back

The physical appearance or behavior of an organism as a result of its genotype.

Front

Define genotype.

Back

The genetic makeup of an organism, consisting of the alleles inherited from its parents.

Front

What does the letter 'T' represent in genetics?

Back

Typically represents a dominant allele, such as Tall in a plant.

Front

What does the letter 't' represent in genetics?

Back

Typically represents a recessive allele, such as short in a plant.

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the phenotypic ratio of a monohybrid cross?

Back

Typically 3:1 for dominant to recessive traits.

Front

What is the genotypic ratio of a monohybrid cross?

Back

Typically 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive.

Front

What is a pedigree chart?

Back

A diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors.