Punnett Square Practice

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.

Front

What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present (e.g., W in the case of long whiskers).

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present (e.g., w for short whiskers).

Front

What is the expected percentage of offspring with short whiskers from a cross of WW and Ww?

Back

0% - All offspring will have long whiskers.

Front

What is the expected percentage of offspring with no belly fur from a cross of Aa and Aa?

Back

25% - There is a 25% chance of offspring being aa (no belly fur).

Front

What is the probability of offspring having round eyes from a cross of Rr (heterozygous) and RR (homozygous dominant)?

Back

100% - All offspring will have round eyes.

Front

Can two recessive trait parents produce an offspring with a dominant trait?

Back

No, two recessive trait parents cannot produce an offspring with a dominant trait.

Front

What type of female Zork should Ralph marry to maximize chances of having two fangs?

Back

Ralph should marry a female with the homozygous dominant genotype for number of fangs.