Monohybrid Crosses

Front

What is the term for having two different genes for a trait?

Back

Heterozygous

Front

If a couple with brown-eyed children (Bb) has a fourth child, what is the chance it will be blue-eyed?

Back

They have a 25% chance of having a blue-eyed child.

Front

What is an allele whose trait always shows up in the organism when the allele is present?

Back

Dominant allele

Front

What is the term for having two of the same genes for a trait?

Back

Homozygous

Front

In a cross between two heterozygous cacti (Aa x Aa), what percentage of their offspring are expected to have short arms?

Back

25%

Front

What is the definition of a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is the definition of a recessive allele?

Back

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

Front

What does genotype refer to?

Back

The genetic makeup of an organism, represented by alleles.

Front

What does phenotype refer to?

Back

The observable characteristics or traits of an organism.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.