Punnett Square Practice

Front

What is a Punnett Square?

Back

A tool scientists use to determine all the possible genotypes for offspring.

Front

What does genotype mean?

Back

The genetic makeup of an organism, represented by letters (e.g., BB, Bb, bb).

Front

What does phenotype mean?

Back

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

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles (e.g., BB or bb), while heterozygous means having two different alleles (e.g., Bb).

Front

What is the probability of getting a homozygous recessive offspring from a cross between Bb and Bb?

Back

25%.

Front

If a purple-flowered pea plant (PP) is crossed with a white-flowered pea plant (pp), what will be the phenotype of the offspring?

Back

All offspring will be purple.

Front

What is the genotype of a homozygous dominant organism?

Back

It is represented by two uppercase letters (e.g., BB).

Front

What is the genotype of a homozygous recessive organism?

Back

It is represented by two lowercase letters (e.g., bb).

Front

What is the expected genotype ratio from a cross between Bb and bb?

Back

50% Bb and 50% bb.

Front

What does it mean if an organism is heterozygous for a trait?

Back

It has one dominant allele and one recessive allele (e.g., Bb).