Genetic Terms - Practice

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 from the parents.

Front

What is an allele?

Back

Different forms of a gene that can exist at a specific locus on a chromosome.

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Aa).

Front

What is a dominant allele?

Back

An allele that expresses its trait even when only one copy is present in the genotype.

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype for pink fur in a plant where brown fur (B) is dominant?

Back

bb (homozygous recessive).

Front

If a plant has the genotype RR, what is its phenotype?

Back

Red (since R is dominant).