Genetics- Monohybrid Punnett Squares

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by the alleles it possesses (e.g., BB, Bb, bb).

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype (e.g., brown eyes, tall plant).

Front

What does homozygous mean?

Back

An organism with two identical alleles for a particular trait (e.g., BB or bb).

Front

What does heterozygous mean?

Back

An organism with two different alleles for a particular trait (e.g., Bb).

Front

What is a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele (e.g., B in Bb).

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present (e.g., b in bb).

Front

How are alleles represented?

Back

Dominant alleles are represented by uppercase letters (e.g., B), while recessive alleles are represented by lowercase letters (e.g., b).

Front

What is a Punnett square?

Back

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

Front

What is the purpose of a monohybrid cross?

Back

To study the inheritance of a single trait by crossing two organisms differing in one trait.

Front

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

Back

Tall, because T (tall) is dominant over t (short).